OBOS (not vibecoded) | Operating System Development | Page 41

flint idol Jan 28, 2026, 4:11 PM

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my memory manager already has a shitton of overhead

dense vigil Jan 28, 2026, 4:11 PM

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Well it would be more of a tracking of the MMAPd region its self describing the status of the pages in there

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And that’s owned by the processes

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And then the kernel has a reclaim list that points to all the different MMAPd files and the procs that have them mapped

flint idol Jan 28, 2026, 4:12 PM

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dense vigil Well it would be more of a tracking of the MMAPd region its self describing the ...

that wouldn't work, as the struct page is reclaimed

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I would have to keep a list of virtual addresses and contexts that have a struct page mapped

dense vigil Jan 28, 2026, 4:12 PM

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So the kernel goes to the list and then tells all the processes on one of the MMAPd files to unmap it

dense vigil Jan 28, 2026, 4:13 PM

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flint idol that wouldn't work, as the struct page is reclaimed

This would be seperate from other things no?

flint idol Jan 28, 2026, 4:13 PM

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the kernel would go through the list and remap the pages as unpresent

flint idol Jan 28, 2026, 4:13 PM

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dense vigil This would be seperate from other things no?

struct page is also pagecache entry

dense vigil Jan 28, 2026, 4:13 PM

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true

flint idol Jan 28, 2026, 4:14 PM

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I could keep a list of page ranges that have the file mapped in the vnode

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the page range already contains information about what range of the file is mapped

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so I would do some simple arithmetic and iteration over that list to invalidate mapped pages

dense vigil Jan 28, 2026, 4:17 PM

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true

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And a page range is part of the VMM right

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Like when you MMAP 4MB or some crap

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It keeps track of that’s

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Right

flint idol Jan 28, 2026, 4:25 PM

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dense vigil And a page range is part of the VMM right

yeah

dense vigil Jan 28, 2026, 4:26 PM

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flint idol I could keep a list of page ranges that have the file mapped in the vnode

And then you go though vnodes to reclaim them

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https://tenor.com/view/gif-gif-9403556598434283568

Tenor

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I think this shall work

flint idol Jan 28, 2026, 4:26 PM

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well no I go through the standby list

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#1141057599584878645 message

flint idol Jan 28, 2026, 4:27 PM

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flint idol well no I go through the standby list

scrap that

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the pmm goes through the standby list to reclaim memory when it needs to do an allocation on OOM

dense vigil Jan 28, 2026, 4:28 PM

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What is the standby list?

flint idol Jan 28, 2026, 4:28 PM

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flint idol https://discord.com/channels/440442961147199490/1141057599584878645/127470189148...

read this

dense vigil Jan 28, 2026, 4:29 PM

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So a list of things on standby to be reclaimed?

flint idol Jan 28, 2026, 4:30 PM

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list of things that can be reclaimed

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reclamation in obos only happens when the pmm freelists are completely exhausted

dense vigil Jan 28, 2026, 4:30 PM

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Ahhh

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So that would refer to such vnodes then? So that you can go through and invalidate the things

flint idol Jan 28, 2026, 4:31 PM

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yeah

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specifically the struct page refers to a vnode

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and also contains the file offset

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that it refers to in the pagecache

dense vigil Jan 28, 2026, 4:31 PM

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Basically all the info on how to properly invalidate it in the page cache and unmap it from everything etc

flint idol Jan 28, 2026, 4:32 PM

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dense vigil Basically all the info on how to properly invalidate it in the page cache and un...

thats in the struct page

dense vigil Jan 28, 2026, 4:32 PM

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Yes the struct page for the standby list.

flint idol Jan 28, 2026, 4:32 PM

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the standby list is simply a list of non dirty, reclaimable (i.e., pages written back to disk or swap) pages

dense vigil Jan 28, 2026, 4:32 PM

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Or wait what’s a struct page exactly

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A PFNdb entry?

flint idol Jan 28, 2026, 4:32 PM

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dense vigil A PFNdb entry?

yes

dense vigil Jan 28, 2026, 4:33 PM

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Ahhh so that would have pointers to the vnodes

flint idol Jan 28, 2026, 4:33 PM

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yes

dense vigil Jan 28, 2026, 4:33 PM

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And then when you need to reclaim a page that has pointers to all the data to unmap and then invalidate the cache entry and then have it freed

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https://tenor.com/view/gif-gif-9403556598434283568

Tenor

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And it could also see if it’s dirty and have that sent back to disk etc

flint idol Jan 28, 2026, 4:34 PM

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dense vigil And it could also see if it’s dirty and have that sent back to disk etc

anything in the standby list is not dirty

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the modified page list has dirty pages

dense vigil Jan 28, 2026, 4:34 PM

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Ahhh

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And when you MMAP a file and read from it it’s okay

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But then if you write it’s marked dirty

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Etc etc?

flint idol Jan 28, 2026, 4:35 PM

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dense vigil But then if you write it’s marked dirty

yeah

dense vigil Jan 28, 2026, 4:35 PM

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I presume if the standby list is empty you can tell the driver to flush the dirty pages to disk?

flint idol Jan 28, 2026, 4:36 PM

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there is a thread called the page writer which is responsible for taking pages on the modified page list and writing them back to disk, and throwing them onto standby

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(i say writing them back to disk but technically it can be written back anywhere)

dense vigil Jan 28, 2026, 4:36 PM

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true

flint idol Jan 28, 2026, 4:36 PM

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and the dirty and standby page lists include both anonymous pages and file pages

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anonymous pages are written back to swap while file pages use the backing driver to writeback the pages

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(i say backing driver instead of fs driver because any block device can also be a file page)

dense vigil Jan 28, 2026, 4:38 PM

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Okay but I think I get the gist of this

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Thank you for information

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I hope I don’t forget it 💀

flint idol Jan 28, 2026, 4:39 PM

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dense vigil I hope I don’t forget it 💀

feel free to inquire me if you forget

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btw i would also ask fadanoid about his MM design his is probably cooler than mine

dense vigil Jan 28, 2026, 4:39 PM

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Thank you cool USB man

flint idol Jan 28, 2026, 4:40 PM

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np

dense vigil Jan 28, 2026, 4:40 PM

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Hopefully I can get off my ass today and write some code 💀

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I’ve mostly been absorbing knowledge

flint idol Jan 28, 2026, 4:40 PM

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I promised my friends I would start a terraria server in like 20 minutes

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so I might not get much done

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anyway I will now be implementing TCP SACK

dense vigil Jan 28, 2026, 4:41 PM

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I was uhhh also wanting to play terraria 💀

flint idol Jan 28, 2026, 4:45 PM

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flint idol anyway I will now be implementing TCP SACK

basically how this will for reception is that instead of sending an ACK when rcv.nxt is advanced i'll send a SACK packet whenever a packet is inserted into the buffer

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idk if i need to change transmission logic yet

dense vigil Jan 28, 2026, 4:47 PM

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Why do you need SACK?

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~~also don’t make a joke about this don’t make a joke about it being called SACK~~

flint idol Jan 28, 2026, 4:49 PM

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dense vigil Why do you need SACK?

selective ACK = less retransmissions from the peer = better performance

dense vigil Jan 28, 2026, 4:49 PM

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Btw for my ram block device what’s your opinion on using a radix tree for it hmmCat

dense vigil Jan 28, 2026, 4:49 PM

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flint idol selective ACK = less retransmissions from the peer = better performance

true

flint idol Jan 28, 2026, 4:50 PM

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flint idol idk if i need to change transmission logic yet

oh yeah i just need to make it not retransmit packets that have been ACKed selectively

flint idol Jan 28, 2026, 4:50 PM

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dense vigil Btw for my ram block device what’s your opinion on using a radix tree for it <:h...

what would a block device need radix trees for?

dense vigil Jan 28, 2026, 4:50 PM

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For an in memory one

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Similar to page table

flint idol Jan 28, 2026, 4:50 PM

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seems fun

dense vigil Jan 28, 2026, 4:51 PM

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Yeah shouldn’t be too bad

flint idol Jan 28, 2026, 4:51 PM

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i would personally have done a linear buffer but like that seems a lot more memory-efficient

dense vigil Jan 28, 2026, 4:52 PM

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dense vigil Like when you MMAP 4MB or some crap

Wait how does this know what parts it can free from because it may not be a fully backed backing. Oh wait that’s why you use the PFNdb and have it separate and this is just so you can know where to look and unmap crap

dense vigil Jan 28, 2026, 4:52 PM

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flint idol i would personally have done a linear buffer but like that seems a lot more memo...

Yeah because I’m gonna lazy allocate the backing pages too

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So if you never touch a block

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It’s just never allocated

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I’m gonna limit it to 256mb and do two layers have 256

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Just because easy

flint idol Jan 28, 2026, 4:53 PM

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oki

dense vigil Jan 28, 2026, 4:53 PM

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And 99% of use cases for such a device won’t need more

flint idol Jan 28, 2026, 4:53 PM

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there's some dumbass in #osdev-misc-1 lmao u should check it out

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making unintellectual arguments about how "linux bad windows good" 🥀

dense vigil Jan 28, 2026, 4:54 PM

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🥀

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Be there in a sec

dense vigil Jan 28, 2026, 4:54 PM

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dense vigil Wait how does this know what parts it can free from because it may not be a full...

But correct right

flint idol Jan 28, 2026, 4:55 PM

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dense vigil Wait how does this know what parts it can free from because it may not be a full...

wdym "which parts it can free from"

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like which parts can be reclaimed? which parts can be unmapped?

dense vigil Jan 28, 2026, 4:55 PM

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flint idol wdym "which parts it can free from"

Like what pages are actually backed vs not

flint idol Jan 28, 2026, 4:55 PM

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it checks the pfndb

dense vigil Jan 28, 2026, 4:56 PM

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Yeah

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I just wanted to make sure that’s the reasoning for the PFNDB

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For that

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And the mapping is just so you know what to mark as non available and where etc

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For the references

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Right?

flint idol Jan 28, 2026, 5:05 PM

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y

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ea

flint idol Jan 28, 2026, 5:08 PM

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dense vigil <:true:1320478073358913629>

https://datatracker.ietf.org/doc/html/rfc2018
btw if you wanted a read on TCP selective ACK

IETF Datatracker

RFC 2018: TCP Selective Acknowledgment Options

This memo proposes an implementation of SACK and discusses its performance and related issues. [STANDARDS-TRACK]

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Since the data receiver may later discard data reported in a SACK option, the sender MUST NOT discard data before it is acknowledged by the Acknowledgment Number field in the TCP header.

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interesting

dense vigil Jan 28, 2026, 5:12 PM

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Why not just assume a perfect world where no packets get lost

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trol

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It’s the users problem

flint idol Jan 28, 2026, 5:12 PM

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dense vigil Why not just assume a perfect world where no packets get lost

see: UDP

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UDP has literally not changed since august 1980

dense vigil Jan 28, 2026, 5:13 PM

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XD

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Dose your thing handle UDP well

flint idol Jan 28, 2026, 5:13 PM

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yeah

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literally the easiest shit ever

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reception: just throw all received packets onto a per-port data queue

dense vigil Jan 28, 2026, 5:14 PM

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Who needs TCP then PSP1G_pspTrollar

flint idol Jan 28, 2026, 5:14 PM

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transmission: formulate the 4-field header and send it to the destination through the IP stack

flint idol Jan 28, 2026, 5:14 PM

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dense vigil Who needs TCP then <:PSP1G_pspTrollar:1434611394782691429>

http

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minecraft

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ftp

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ssh

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etc.

flint idol Jan 28, 2026, 5:15 PM

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flint idol transmission: formulate the 4-field header and send it to the destination throug...

typedef struct udp_header {
    uint16_t src_port;
    uint16_t dest_port;
    uint16_t length;
    uint16_t chksum;
} udp_header;```

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lol

dense vigil Jan 28, 2026, 5:15 PM

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I mean witeguard is UDP right

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And implements TCP ontop

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Or some shit

flint idol Jan 28, 2026, 5:16 PM

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sending a udp packet is literally just:

udp_header hdr = {
  .src_port=host_to_be16(src),
  .dest_port=host_to_be16(dest),
  .length=host_to_be16(length),
  .chksum=0 // checksum is not even fuckin required
};```

flint idol Jan 28, 2026, 5:16 PM

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dense vigil I mean witeguard is UDP right

i wouldnt know

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it probably sends IP packets on top of a UDP socket

dense vigil Jan 28, 2026, 5:17 PM

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flint idol sending a udp packet is literally just: ```c udp_header hdr = { .src_port=host...

The checksum isn’t required?

flint idol Jan 28, 2026, 5:17 PM

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not for udp

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although the ip header does have a checksum that is required to exist and be checked

dense vigil Jan 28, 2026, 5:17 PM

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true

flint idol Jan 28, 2026, 5:18 PM

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flint idol sending a udp packet is literally just: ```c udp_header hdr = { .src_port=host...

u wont ever catch obos sending udp packets with a non-zero checksum btw

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reason why: i couldnt figure out the algorithm properly 💀

dense vigil Jan 28, 2026, 5:18 PM

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flint idol reason why: i couldnt figure out the algorithm properly 💀

💀

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Use the check summmm

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You have to sum the check

flint idol Jan 28, 2026, 5:19 PM

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talk is cheap send patches

flint idol Jan 28, 2026, 5:19 PM

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flint idol sending a udp packet is literally just: ```c udp_header hdr = { .src_port=host...

(and some sort of ipv4_transmit(nic, dest_addr, &hdr);)

dense vigil Jan 28, 2026, 5:19 PM

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flint idol talk is cheap send patches

true

flint idol Jan 28, 2026, 5:21 PM

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mkay im waiting for the patches to come in

dense vigil Jan 28, 2026, 5:24 PM

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This isn’t so bad

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Tbh

flint idol Jan 28, 2026, 5:24 PM

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tbh i was just too lazy

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btw obos does have a ones complement function u can use

dense vigil Jan 28, 2026, 5:24 PM

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It’s just append some data and sum some bytes right

flint idol Jan 28, 2026, 5:25 PM

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something like that

dense vigil Jan 28, 2026, 5:25 PM

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Well prepend

flint idol Jan 28, 2026, 5:25 PM

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no append

dense vigil Jan 28, 2026, 5:25 PM

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It says prefixed

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But it dosnt matter

flint idol Jan 28, 2026, 5:25 PM

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yeah the pseudo-header is prepended

dense vigil Jan 28, 2026, 5:25 PM

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Because it’s just summing it all

flint idol Jan 28, 2026, 5:25 PM

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flint idol yeah the pseudo-header is prepended

and data is appended onto it

dense vigil Jan 28, 2026, 5:26 PM

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yeah

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It’s pseudo header header data padded data to make the length divisible by 2?

flint idol Jan 28, 2026, 5:26 PM

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btw u can copy tcp_chksum

dense vigil Jan 28, 2026, 5:26 PM

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And then sum all the bytes with ones complement

flint idol Jan 28, 2026, 5:26 PM

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flint idol btw u can copy `tcp_chksum`

to generate the udp checksum

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you just need to generate the psuedo-header

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static uint16_t tcp_chksum(const void *seg1, size_t sz_seg1, const void* seg2, size_t sz_seg2)

dense vigil Jan 28, 2026, 5:27 PM

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It’s legit the same PSP1G_pspTrollar

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Lmfao

flint idol Jan 28, 2026, 5:27 PM

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(i did this to avoid having to do any data copying in the tcp stack)

dense vigil Jan 28, 2026, 5:27 PM

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So
Copy that function

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Then generate the pseudo header

flint idol Jan 28, 2026, 5:27 PM

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dense vigil It’s legit the same <:PSP1G_pspTrollar:1434611394782691429>

yeah literally the exact fckn same

    struct {
        uint32_t src_addr;
        uint32_t dest_addr;
        uint8_t zero;
        uint8_t protocol;
        uint16_t tcp_length;
    } OBOS_PACK ip_psuedo_header```

dense vigil Jan 28, 2026, 5:27 PM

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Checksum that a little

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And then the rest of the function

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PSP1G_pspTrollar

dense vigil Jan 28, 2026, 5:28 PM

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flint idol yeah literally the exact fckn same ```c struct { uint32_t src_addr; ...

Do you still want me to implement this trl

flint idol Jan 28, 2026, 5:28 PM

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i was joking

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but if you want to send patches sure

dense vigil Jan 28, 2026, 5:28 PM

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I mean I want to 🙏

flint idol Jan 28, 2026, 5:28 PM

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(dont send actual patches make a PR im not tryna review raw patch files)

dense vigil Jan 28, 2026, 5:29 PM

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trl

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Shit uhhh

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Does the master repo build eighty

flint idol Jan 28, 2026, 5:29 PM

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yeah just make the pseudo header, copy paste tcp_chksum, set the checksum in the header, profit

dense vigil Jan 28, 2026, 5:29 PM

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Right

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So I can do this

flint idol Jan 28, 2026, 5:29 PM

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build eighty?

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what

dense vigil Jan 28, 2026, 5:29 PM

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Built right

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Autocrat

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Autocorrect

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😭

flint idol Jan 28, 2026, 5:30 PM

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yeah the master branch builds... why wouldnt it

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anyway obos now sends SACK PERM in the SYN packets

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now i need to actually implement selective ACK

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first i need to parse the response SYN or the response ACK to see if the peer sent SACK PERM back

dense vigil Jan 28, 2026, 5:36 PM

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Last time it didn’t and crashed on me when I tried to run it

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yaaar

flint idol Jan 28, 2026, 5:36 PM

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well it built

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but it didnt run

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there is a dfference

dense vigil Jan 28, 2026, 5:36 PM

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Does it run

flint idol Jan 28, 2026, 5:36 PM

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runs for me

dense vigil Jan 28, 2026, 5:36 PM

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PSP1G_pspTrollar

flint idol Jan 28, 2026, 5:36 PM

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gh actions build also runs

dense vigil Jan 28, 2026, 5:37 PM

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flint idol yeah just make the pseudo header, copy paste tcp_chksum, set the checksum in the...

Make pseudo header -> prepend to the UDP packet -> tcp checksum -> insert into header -> happy

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Got it

flint idol Jan 28, 2026, 5:37 PM

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no

flint idol Jan 28, 2026, 5:38 PM

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flint idol ```c static uint16_t tcp_chksum(const void *seg1, size_t sz_seg1, const void* se...

look at this

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seg1 is intended for the pseudo-header

dense vigil Jan 28, 2026, 5:38 PM

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It takes two segments?

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Ahhhh

flint idol Jan 28, 2026, 5:38 PM

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seg2 is for the data

dense vigil Jan 28, 2026, 5:38 PM

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Smart

flint idol Jan 28, 2026, 5:38 PM

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and then they are checksummed as if they were one big block

dense vigil Jan 28, 2026, 5:38 PM

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bigbrain

flint idol Jan 28, 2026, 5:38 PM

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so that it doesnt have to do any data moving

blazing python Jan 28, 2026, 5:38 PM

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obos xhci bug fix when

flint idol Jan 28, 2026, 5:38 PM

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dense vigil <:bigbrain:787518451149045771>

why thank you

flint idol Jan 28, 2026, 5:38 PM

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blazing python obos xhci bug fix when

when im done fucking around with TCP

blazing python Jan 28, 2026, 5:39 PM

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flint idol when im done fucking around with TCP

maybe your xhci driver will work on other hw ?

dense vigil Jan 28, 2026, 5:39 PM

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flint idol when im done fucking around with TCP

flint idol Jan 28, 2026, 5:39 PM

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blazing python maybe your xhci driver will work on other hw ?

who knows

dense vigil Jan 28, 2026, 5:39 PM

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I’m gonna make an edit for that

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To be a USB plug

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Brb

flint idol Jan 28, 2026, 5:39 PM

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flint idol who knows

it works on that device with xhci controller passthrough

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(at least, TRBs work)

blazing python Jan 28, 2026, 5:40 PM

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flint idol it works on that device with xhci controller passthrough

then maybe some pci pain

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try to do polling later

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instead of interrupts

flint idol Jan 28, 2026, 5:40 PM

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i tried to poll

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nothing ever showed up

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it's a problem with the enqueue itself

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either that, or the doorbell() function is broken

flint idol Jan 28, 2026, 5:41 PM

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flint idol either that, or the `doorbell()` function is broken

which i tried to check by putting in a TRB in the command ring before setting the command ring dequeue ptr

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but that was also to no avail

dense vigil Jan 28, 2026, 6:00 PM

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dense vigil To be a USB plug

flint idol Jan 28, 2026, 6:02 PM

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lmao

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beautiful

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still some instability

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but that seems unrelated to SACK itself

flint idol Jan 28, 2026, 6:30 PM

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The SACK option SHOULD be filled out by repeating the most recently reported SACK blocks (based on first SACK blocks in previous SACK options) that are not subsets of a SACK block already included in the SACK option being constructed. This assures that in normal operation, any segment remaining part of a non-contiguous block of data held by the data receiver is reported in at least three successive SACK options, even for large-window TCP implementations [RFC1323]). After the first SACK block, the following SACK blocks in the SACK option may be listed in arbitrary order.

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no clue what that is supposed to mean

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anyway, SACK does increase TCP performance a ton

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my only problem is that wireshark is reporting a lot of duplicate ACKs

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(sample)

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i see why, because hdr.ack is the same

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but idk if that's just wireshark unrightfully complaining about my selective ACKs or if it's an actual problem

devout niche Jan 28, 2026, 6:48 PM

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flint idol beautiful

what's up with the performance? (assuming you are downloading from a fast host)

flint idol Jan 28, 2026, 6:48 PM

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devout niche what's up with the performance? (assuming you are downloading from a fast host)

the host is the host

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as in the host os

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and it downloads the file instantly

devout niche Jan 28, 2026, 6:49 PM

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try with a large file, i wonder how it compares to keyronex at present

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i have yet to add header prediction which will hopefully improve mine

flint idol Jan 28, 2026, 6:51 PM

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devout niche try with a large file, i wonder how it compares to keyronex at present

oki

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avg. download is 300k

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(it's really slow cuz obos is dogpoop)

dense vigil Jan 28, 2026, 6:58 PM

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flint idol avg. download is 300k

How fast can it download from my server

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And if it can even do that

flint idol Jan 28, 2026, 10:40 PM

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dense vigil And if it can even do that

well it can

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but i havent checked

flint idol Jan 28, 2026, 10:40 PM

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flint idol well it can

(no reason why it shouldnt be able to lol)

dense vigil Jan 28, 2026, 10:49 PM

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true

flint idol Jan 28, 2026, 11:18 PM

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dense vigil <:true:1276366887755714591>

send me a link to a file ill try and download it from obos

dense vigil Jan 28, 2026, 11:18 PM

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flint idol send me a link to a file ill try and download it from obos

https://files.evalyngoemer.com/share/manuals/usb3-xhci.pdf

flint idol Jan 28, 2026, 11:20 PM

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well it's owrking

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working*

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but le transfer speeds are le shit because obos is le shit™

dense vigil Jan 28, 2026, 11:20 PM

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whats teh speed

flint idol Jan 28, 2026, 11:21 PM

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5k/s

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💀

dense vigil Jan 28, 2026, 11:21 PM

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trl

weary hound Jan 28, 2026, 11:21 PM

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download it over an usb 3 nic :^)

flint idol Jan 28, 2026, 11:23 PM

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um a part of the reason why everything is so slow is probably because there are so many retransmissions

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literally for like every packet transmitted

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and pretty much every ACK in wireshark is marked as duplicate

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like i genuinely do not know if it is TCP or the nic driver at this point

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and i have like no way of knowing

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i think i see a problem

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it ACKs a packet

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and fails to advance rcv.nxt

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and then later sends a selective ACK without having advanced it yet

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and that happens for pretty much every other packet

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why how interesting

flint idol Jan 29, 2026, 12:31 AM

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bruh why is the nic pushing packets with length 4 to the rx queue

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and with EOP set

dense vigil Jan 29, 2026, 12:32 AM

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maybe dont tell the nic to push packets with a length of 4 to the rx queue

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PSP1G_pspTrollar

flint idol Jan 29, 2026, 12:32 AM

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good idea thanks

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i shouldve thought of that

flint idol Jan 29, 2026, 12:33 AM

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dense vigil maybe *dont* tell the nic to push packets with a length of 4 to the rx queue

what's up with that zaval guy lmao

dense vigil Jan 29, 2026, 12:33 AM

#

yeah every nic has a setting to push packets with a length of 4 to the rx queue randomly

flint idol Jan 29, 2026, 12:33 AM

#

"this clown inserts himself into every thread"

#

lmaoooo

dense vigil Jan 29, 2026, 12:33 AM

#

flint idol what's up with that zaval guy lmao

stick inside rear compartment?

flint idol Jan 29, 2026, 12:33 AM

#

maybe it's because when im not in my progress report thread

flint idol Jan 29, 2026, 12:33 AM

#

flint idol maybe it's because when im not in my progress report thread

im BSing

flint idol Jan 29, 2026, 12:35 AM

#

dense vigil yeah every nic has a setting to push packets with a length of 4 to the rx queue ...

ohhh ok thanks

#

i found the rxctl bit to disable that

dense vigil Jan 29, 2026, 12:36 AM

#

dense vigil stick inside rear compartment?

i hope you got the joke

#

yaaar

flint idol Jan 29, 2026, 12:36 AM

#

no im too naive or smth

dense vigil Jan 29, 2026, 12:36 AM

#

stick up ass

flint idol Jan 29, 2026, 12:36 AM

#

ohhh

dense vigil Jan 29, 2026, 12:36 AM

#

trol

#

ok im gonna go eat food

#

then work on my ext2 crap

#

i may actualy make a fuckin standalone version

#

so i can have a test suite on it?

#

wait sorry wc

flint idol Jan 29, 2026, 1:56 AM

#

flint idol why how interesting

yeah im looking at the ideal condition for fast reception

#

which obos sometimes gets

#

and there are very little retransmissions

#

and no SACK packets sent

#

because i presume the kernel gets everything in order

#

wtf

#

why does every other packet in the nic queue

#

have a length of 4 bytes

dense vigil Jan 29, 2026, 2:14 AM

#

flint idol have a length of 4 bytes

are these real packets with headers and crap?

#

tf

flint idol Jan 29, 2026, 2:14 AM

#

no

#

it's a 4-byte runt

#

that has no meaning

dense vigil Jan 29, 2026, 2:14 AM

#

so how do you detect the size

flint idol Jan 29, 2026, 2:14 AM

#

an ethernet header has 14 bytes btw

flint idol Jan 29, 2026, 2:14 AM

#

dense vigil so how do you detect the size

nic tells me

dense vigil Jan 29, 2026, 2:15 AM

#

true

flint idol Jan 29, 2026, 2:15 AM

#

the frame size

dense vigil Jan 29, 2026, 2:15 AM

#

what if you just tossed every other packet trl

#

or tossed 4 byte ones

flint idol Jan 29, 2026, 2:15 AM

#

the kernel discards runts

#

ethernet says that packets have to be 64 bytes or larger, otherwise it is a runt

#

anyway i think the problem is elsewhere anyway

flint idol Jan 29, 2026, 2:16 AM

#

dense vigil what if you just tossed every other packet <:trl:829316641191886888>

btw if you dont mind i will be using your server for occasional tests

#

shouldnt do any harm on the server, but the i might abruptly end the connection if i see there is a bug or obos is doing sm shit wrong

dense vigil Jan 29, 2026, 2:17 AM

#

idc as long as its not breakin shit on my end

flint idol Jan 29, 2026, 2:17 AM

#

it should not™

dense vigil Jan 29, 2026, 2:17 AM

#

im expecting to get hits for downloads n crap

#

just dont dos me tro

#

and if you do

#

you have to send patches

#

to uhh make my kernel better

flint idol Jan 29, 2026, 2:18 AM

#

dense vigil just dont dos me <:tro:1191859481416568903>

as long as ur not using the obos network stack ur good

#

as pretty much everything will reset connections after enough lost ACKs

dense vigil Jan 29, 2026, 2:18 AM

#

trl

#

we will see

flint idol Jan 29, 2026, 2:21 AM

#

dense vigil <:trl:829316641191886888>

btw i might go back to doing xhci dev as tcp dev is also about to drive me to the brink of insanity

dense vigil Jan 29, 2026, 2:22 AM

#

dont make me make an ethernet version of the meme

#

tro

flint idol Jan 29, 2026, 2:37 AM

#

lol

#

e1000e_rx_descr Next RX descriptor: ring #0, PA: 0x443d1340, length: 16
e1000e_rx_desc_buff_write buffer #0, addr: 0x4439c000, offset: 0, from: 0x7fff48a38660, length: 60
e1000e_rx_metadata_status_flags status_flags is 0x1
e1000e_rx_descr Next RX descriptor: ring #0, PA: 0x443d1350, length: 16
e1000e_rx_desc_buff_write buffer #0, addr: 0x4439b000, offset: 0, from: 0x5603560d4304, length: 4```

#

qemu is trolling me rn

#

sometimes i feel like rewriting obos since i have gathered le many knowledge over this past year and a half

#

and i want to write it better

#

but i feel like im in too deep

#

😔

dense vigil Jan 29, 2026, 3:01 AM

#

Maybe make an OBOS3

flint idol Jan 29, 2026, 3:01 AM

#

we already at obos 5 KEKW

dense vigil Jan 29, 2026, 3:01 AM

#

Oh I know

flint idol Jan 29, 2026, 3:01 AM

#

NOBOS: new OBOS trl

dense vigil Jan 29, 2026, 3:01 AM

#

But it’s still called “OBOS”

#

Rights

flint idol Jan 29, 2026, 3:01 AM

#

yes it is still called OBOS

dense vigil Jan 29, 2026, 3:01 AM

#

Call it “OBOS3”

#

To confuse people

flint idol Jan 29, 2026, 3:01 AM

#

lol

dense vigil Jan 29, 2026, 3:02 AM

#

And then act like OBOS2 is a cognito hazard

flint idol Jan 29, 2026, 3:02 AM

#

OBOS3

dense vigil Jan 29, 2026, 3:02 AM

#

That erased its self

flint idol Jan 29, 2026, 3:02 AM

#

trl

dense vigil Jan 29, 2026, 3:02 AM

#

OBOS2?

#

What could that be

#

There is no OBOS2

flint idol Jan 29, 2026, 3:02 AM

#

it's in a repo somewhere on gh

#

find it

#

trl

#

OBOS

dense vigil Jan 29, 2026, 3:03 AM

#

What if you just called it somthing else

#

trl

#

“something else”

#

With the miss spelling

flint idol Jan 29, 2026, 3:03 AM

#

trl

dense vigil Jan 29, 2026, 3:03 AM

#

The somthing else kernel

flint idol Jan 29, 2026, 3:03 AM

#

what if i call it managram

#

(not managarm)

#

it will be a non-pragmatic, synchronous monolithic kernel

dense vigil Jan 29, 2026, 3:04 AM

#

https://tenor.com/view/phineas-and-ferb-disney-disney-plus-major-monogram-gif-7147915062951532393

Tenor

#

Like this person

flint idol Jan 29, 2026, 3:04 AM

#

idk

dense vigil Jan 29, 2026, 3:04 AM

#

His name is managram

#

That’s the joke

flint idol Jan 29, 2026, 3:04 AM

#

oh

#

omg hahahahashdasghdhahahahahahahhahazsdycasg dahahhahahahaha

dense vigil Jan 29, 2026, 3:04 AM

#

I thought managarm was actually managram and named after him

#

So this would be perfect

flint idol Jan 29, 2026, 3:04 AM

#

lol

dense vigil Jan 29, 2026, 3:04 AM

#

😭

flint idol Jan 29, 2026, 3:04 AM

#

ill name it fadanoid, after chuck fadanoid

dense vigil Jan 29, 2026, 3:05 AM

#

What if you call it evalynOS

#

trl

#

After me

#

Because I’m so good and cool

flint idol Jan 29, 2026, 3:05 AM

#

without the uppercase E for trademark reasons trl

dense vigil Jan 29, 2026, 3:05 AM

#

Actually

#

I trademark both

#

tro

flint idol Jan 29, 2026, 3:05 AM

#

anyway im not rewriting

flint idol Jan 29, 2026, 3:05 AM

#

dense vigil I trademark both

damn

dense vigil Jan 29, 2026, 3:05 AM

#

I use capital and lowercase

#

Mixed in places

#

trl

flint idol Jan 29, 2026, 3:05 AM

#

what about evaLynOs

dense vigil Jan 29, 2026, 3:06 AM

#

Damn you got me there

flint idol Jan 29, 2026, 3:06 AM

#

named after my two imaginary exes (ive been single all my life), eva and lyn

#

trl

dense vigil Jan 29, 2026, 3:06 AM

#

trol

#

Btw how does your tmpFS work

#

And handle MMAP

flint idol Jan 29, 2026, 3:07 AM

#

dense vigil Btw how does your tmpFS work

hopes and dreams

#

(undertale reference did you catch it?)

dense vigil Jan 29, 2026, 3:07 AM

#

Because aparently my idea is dumb and stupid with ext2 and a ram block device to make things simpler

dense vigil Jan 29, 2026, 3:07 AM

#

flint idol (undertale reference did you catch it?)

Yup

dense vigil Jan 29, 2026, 3:07 AM

#

dense vigil Because aparently my idea is dumb and stupid with ext2 and a ram block device to...

Even though I don’t see why it wouldn’t be fine trl

flint idol Jan 29, 2026, 3:07 AM

#

https://tenor.com/view/undertale-asriel-dreemurr-tobyfox-flowey-frisk-gif-7429666

Tenor

dense vigil Jan 29, 2026, 3:07 AM

#

dense vigil Even though I don’t see why it wouldn’t be fine <:trl:829316641191886888>

Like I have several reasons for picking this

flint idol Jan 29, 2026, 3:08 AM

#

well this fills me with determination to work on tcp trl

#

https://tenor.com/view/undertale-gif-20224140

Tenor

dense vigil Jan 29, 2026, 3:08 AM

#

And I got shat on for wanting VFS in kernel and filesystem drivers in user

#

slongesab

#

I just wana do somthing different and cool

flint idol Jan 29, 2026, 3:08 AM

#

flint idol well this fills me with determination to work on tcp <:trl:829316641191886888>

(did you catch the undertale reference?)

dense vigil Jan 29, 2026, 3:08 AM

#

flint idol (did you catch the undertale reference?)

Yes I was just about to post a meme

#

flint idol Jan 29, 2026, 3:08 AM

#

lol

dense vigil Jan 29, 2026, 3:09 AM

#

dense vigil I just wana do somthing different and cool

And the slightly more ram usage of the initrd

#

Dosnt even matter

#

It’s an init rd

#

It’s going to get fucking nuked

#

After root is mounted

#

And it has a really small size

#

So slongesab

#

Idk why my idea was said to just be bad

flint idol Jan 29, 2026, 3:09 AM

#

do it to prove them wrong (or right)

dense vigil Jan 29, 2026, 3:09 AM

#

true

#

They also said it wouldn’t fit enough the normal VFS system?

#

Which no it would very well would

#

Idk

#

I’m just gonna do it and worst case redo it

#

Worst case I have a mostly working ext2 driver I can polish for something else

flint idol Jan 29, 2026, 3:10 AM

#

im gonna sing in here in a bit wait

#

fuck i forgot the lyrics

#

greduoijtgfhrewsuoighnrews

#

ive no clue what's causing the tcp to discard me data

#

i added logs to the TCP stack

#

and it reports nothing or very little packets dropped

dense vigil Jan 29, 2026, 3:12 AM

#

flint idol do it to prove them wrong (or right)

Ya know what thank you for this

#

You believe in me

#

Which means I can do it

#

I will prove them wrong (or right and eat my own words)

flint idol Jan 29, 2026, 3:13 AM

#

flint idol im gonna sing in here in a bit wait

waitwait i remember

#

I SHIVERED BENEATH YOU
ALL WRAPPED UP IN EMBERS
IT WAS A NIGHT
TO REMEMMMBER

#

THEN IO WALKED AWAY

dense vigil Jan 29, 2026, 3:13 AM

#

But either way somthing good will come of it

flint idol Jan 29, 2026, 3:13 AM

#

YOU ASKED ME TO STAY

#

NOW UR THINKIN OF WHAT I COULDA BEEN

#

BUT YOUVE BECOME SOMEONE IVE SEEN BEFORE

#

I SWORE... ID SEEN YOU BEFORE..?

#

anyway uh

#

"a night to remember - beabadoobee&laufey"

#

it sounds a lot better when ur not reading lyrics from a discord screen

#

i think

#

idk my taste in music is shi

dense vigil Jan 29, 2026, 3:15 AM

#

We should sing bohemian rhapsody

#

But I wana say thank you for being a good from oberrow

#

And believing in me and my ideas

flint idol Jan 29, 2026, 3:16 AM

#

dense vigil We should sing bohemian rhapsody

no clue what that is

dense vigil Jan 29, 2026, 3:18 AM

#

flint idol no clue what that is

YOU HAVE NEVER LISTENED TO BOHEMIAN RHAPSODY

flint idol Jan 29, 2026, 3:18 AM

#

nop

#

NOP-0x90

#

im an x86 cpui fsdofkdspolfkdslp;

#

i might be a bit tired or smtghrsweuij

#

smth

#

ofkdsoklfm

#

ads

#

fsdfsd

#

ffsgsdf

dense vigil Jan 29, 2026, 3:18 AM

#

https://youtu.be/fJ9rUzIMcZQ

YouTube

Queen Official

Queen – Bohemian Rhapsody (Official Video Remastered)

REMASTERED IN HD TO CELEBRATE ONE BILLION VIEWS!
Taken from A Night At The Opera, 1975.

Click here to buy the DVD with this video at the Official Queen Store:
http://www.queenonlinestore.com

The official 'Bohemian Rhapsody' music video. Taken from Queen - 'Greatest Video Hits 1'. Lyrics below:

Is this the real life?
Is this just fantasy?
Caug...

▶ Play video

flint idol Jan 29, 2026, 3:19 AM

#

what is happening in the lyrics

#

why are we sayin bismillah

dense vigil Jan 29, 2026, 3:19 AM

#

flint idol what is happening in the lyrics

its fucked on google

#

tro

dense vigil Jan 29, 2026, 3:19 AM

#

flint idol im an x86 cpui fsdofkdspolfkdslp;

F0 0F C7 C8

flint idol Jan 29, 2026, 3:19 AM

#

fuck

#

u got me there

flint idol Jan 29, 2026, 3:20 AM

#

dense vigil its fucked on google

nah that's what it says on other sites

dense vigil Jan 29, 2026, 3:20 AM

#

trl

flint idol Jan 29, 2026, 3:20 AM

#

just transliterated

dense vigil Jan 29, 2026, 3:22 AM

#

@flint idol ya know what you need

#

a break from USB and TCP/IP

#

lets play terraria

flint idol Jan 29, 2026, 3:23 AM

#

that's a good idea but it's a bit late rn

dense vigil Jan 29, 2026, 3:23 AM

#

maybe tomorrow?

#

i was just gonna play an hour or some then sleep

flint idol Jan 29, 2026, 3:23 AM

#

tomorrow im free yeah

#

im free until monday

#

done all my exams

dense vigil Jan 29, 2026, 3:23 AM

#

oh nice nice

flint idol Jan 29, 2026, 3:24 AM

#

and there is no chance im going outside in this -20 celsius weather

dense vigil Jan 29, 2026, 3:24 AM

#

yeah lets play tomorrow and take a break from osdev both trl

flint idol Jan 29, 2026, 3:24 AM

#

flint idol and there is no chance im going outside in this -20 celsius weather

thats like -6 in freedom

flint idol Jan 29, 2026, 3:24 AM

#

flint idol and there is no chance im going outside in this -20 celsius weather

(without windchill!)

dense vigil Jan 29, 2026, 3:24 AM

#

oh shi terraria added non binary voices and its a slime gloop XD

#

based

flint idol Jan 29, 2026, 3:24 AM

#

damn

flint idol Jan 29, 2026, 3:25 AM

#

dense vigil oh shi terraria added non binary voices and its a slime gloop XD

i will tell you

#

i barely have played this game

dense vigil Jan 29, 2026, 3:25 AM

#

i havent played in ages so

#

we just playing normal mode

flint idol Jan 29, 2026, 3:25 AM

#

guess we're the same then

dense vigil Jan 29, 2026, 3:25 AM

#

i may make an expert world just for one boss to get the shield

#

because its easy enough

flint idol Jan 29, 2026, 3:25 AM

#

i c

dense vigil Jan 29, 2026, 3:26 AM

#

the eye of cathulu in expert mode drops a really sick item

flint idol Jan 29, 2026, 3:26 AM

#

minecraft would also be nice, but alas, multiplayer is hard to do on java

dense vigil Jan 29, 2026, 3:26 AM

#

and diff is tied to world not charater

#

so ezpz

dense vigil Jan 29, 2026, 3:26 AM

#

flint idol minecraft would also be nice, but alas, multiplayer is hard to do on java

i have a dedicated server box for it

#

if you wanted to

flint idol Jan 29, 2026, 3:26 AM

#

oo

dense vigil Jan 29, 2026, 3:26 AM

#

but im kinda bored of it

#

well its also my git server

#

trl

flint idol Jan 29, 2026, 3:26 AM

#

fair

#

lol

#

#

lies

dense vigil Jan 29, 2026, 3:27 AM

#

its not up rn

#

lmao

flint idol Jan 29, 2026, 3:27 AM

#

smh

dense vigil Jan 29, 2026, 3:27 AM

#

https://modded.evalyngoemer.com/

#

i direct you to here though

#

hosted on the same box

#

that has all my old playthroughs

flint idol Jan 29, 2026, 3:27 AM

#

interesting

dense vigil Jan 29, 2026, 3:28 AM

#

all ran on that server

flint idol Jan 29, 2026, 3:28 AM

#

because noip.com is dumb obos-dev.ddns.net's dns is gone 😔

#

oh nvm it's back up

dense vigil Jan 29, 2026, 3:28 AM

#

no static ip

flint idol Jan 29, 2026, 3:28 AM

#

no it's a static ip

dense vigil Jan 29, 2026, 3:28 AM

#

https://tenor.com/view/megamind-gif-26070434

Tenor

flint idol Jan 29, 2026, 3:28 AM

#

i couldn't be damned to pay for a domain

dense vigil Jan 29, 2026, 3:28 AM

#

true

#

i have email server tho

#

so i have domain

#

shi whens your birthday

flint idol Jan 29, 2026, 3:29 AM

#

also obos also happens to be the name of a big norweigian houes development company

#

june 8

dense vigil Jan 29, 2026, 3:29 AM

#

il buy you a domain if i can

flint idol Jan 29, 2026, 3:29 AM

#

nah it's good lol

flint idol Jan 29, 2026, 3:29 AM

#

flint idol also obos also happens to be the name of a big norweigian houes development comp...

and they bought out all obos-like domains

dense vigil Jan 29, 2026, 3:29 AM

#

exists

flint idol Jan 29, 2026, 3:29 AM

#

btw for legal purposes, obos' name is not obos, and it is oberrow os

flint idol Jan 29, 2026, 3:30 AM

#

dense vigil exists

that would imply obos is professional which it isnt

#

idk

dense vigil Jan 29, 2026, 3:30 AM

#

what about this

#

when i get some spare cash

#

il buy it for ya

#

and even give hosting

#

with SSL and everything

flint idol Jan 29, 2026, 3:30 AM

#

nono it's good

#

my vps is only 10 bucks a month and i only host files on it

#

and idk if youve ever visited http://obos-dev.ddns.net/

#

but it's a really low-effort website

dense vigil Jan 29, 2026, 3:31 AM

#

i mean its nothing to me to get for you

flint idol Jan 29, 2026, 3:31 AM

#

i insist, it is fine

dense vigil Jan 29, 2026, 3:31 AM

#

okay ;3

#

lmk if there is anything else you need

#

also why no SSL on there slongesab

#

lets encrypt is free

flint idol Jan 29, 2026, 3:32 AM

#

hm

dense vigil Jan 29, 2026, 3:32 AM

#

and its like 2 comnmands

#

install certbot

#

certbot install or whatever

#

but yeah @flint idol do the SSL pls

flint idol Jan 29, 2026, 3:37 AM

#

yeah

#

The requested apache plugin does not appear to be installed

#

yeah what's the goddamn plugin

#

apache documentation is shit

flint idol Jan 29, 2026, 3:44 AM

#

dense vigil but yeah <@841762704766140486> do the SSL pls

https://obos-dev.ddns.net/

#

https™

dense vigil Jan 29, 2026, 3:51 AM

#

also you should setup copyparty for your file server trl and also use a markdown redner framework for the main site

#

is realy easy

dense vigil Jan 29, 2026, 3:51 AM

#

flint idol apache documentation is shit

use nginx but certbot still needs the moduke for it

#

makin my world

flint idol Jan 29, 2026, 4:02 AM

#

oh maybe the reason tcp is so slow is because of the lack of congestion control in obos

#

*a reason

flint idol Jan 29, 2026, 4:05 AM

#

flint idol oh maybe the reason tcp is so slow is because of the lack of congestion control ...

uh nvm that has nothing to do with reception

#

wait

#

i havent considered

#

that obos is sending ACKs

#

but the nic driver fails to send them

#

and silently drops them

#

also something i will note is that obos sends a lot of detached ACKs

#

so if it received like 10 packets for example

#

it will ACK each of those 10 packets' with one packet each

#

but what it should technically do is after getting 10 packets, it should ACK the 10th packet only

#

thinkong

#

why every ~56 packets there is retransmisison

#

that has to be a coincidence

#

nvm

dense vigil Jan 29, 2026, 4:32 AM

#

flint idol why every ~56 packets there is retransmisison

why does 56 seem familar

flint idol Jan 29, 2026, 4:32 AM

#

7*8=56

dense vigil Jan 29, 2026, 4:32 AM

#

true

flint idol Jan 29, 2026, 5:02 AM

#

with a simple optimization i was able to improve speed on external hosts

#

i made the nic driver insert packets into the network stack

#

instead of having the network stack have to wait for packets from the nic

#

but one thing i am noticing is that download speeds are inconsistent

#

throughout the connection

#

and it kinda looks like sin(x)=y

#

the fluncations

#

it goes from fast to slow, then to fast, repeat

#

#

which sounds like a problem with window management (?)

#

i need a solution for all these short ACK bursts

#

i have just observed that download speeds are faster using the qemu user backend

#

probably because it's linux doing all the heavy lifting

dense vigil Jan 29, 2026, 5:23 AM

#

i wonder what happens on a physical nic?

flint idol Jan 29, 2026, 5:23 AM

#

i could try on a test subject...

dense vigil Jan 29, 2026, 5:24 AM

#

btw my file server caps at 100mbps btw

flint idol Jan 29, 2026, 5:24 AM

#

obos wasn't making it that far anyway

dense vigil Jan 29, 2026, 5:24 AM

#

i can spin one up that has up to 10gbps (still 1gbps realistic due to stuff)

flint idol Jan 29, 2026, 5:25 AM

#

flint idol obos wasn't making it that far anyway

^

dense vigil Jan 29, 2026, 5:25 AM

#

true

flint idol Jan 29, 2026, 5:25 AM

#

i am getting kb speeds on obos

dense vigil Jan 29, 2026, 5:25 AM

#

but like for later if you need

flint idol Jan 29, 2026, 5:25 AM

#

i dont even think i have fast enough wifi

dense vigil Jan 29, 2026, 5:25 AM

#

heh

#

do a speed test

flint idol Jan 29, 2026, 5:26 AM

#

~500mbps

#

download

#

also the wifi in my room is quite shit

dense vigil Jan 29, 2026, 5:26 AM

#

yeah you may hit the cap on that server

flint idol Jan 29, 2026, 5:27 AM

#

for the real hardware test

#

i will only be doing it against my pc

#

through a direct ethernet connection

#

because only god knows what the nic driver is about to do

dense vigil Jan 29, 2026, 5:28 AM

#

trl

#

imagine it works perfectly

flint idol Jan 29, 2026, 5:28 AM

#

oh fuh no the iso is like a gb with all the packages i was testing installed\

dense vigil Jan 29, 2026, 5:28 AM

#

first try

flint idol Jan 29, 2026, 5:29 AM

#

that's not gonna load until february

dense vigil Jan 29, 2026, 5:29 AM

#

huh

flint idol Jan 29, 2026, 5:29 AM

#

flint idol that's not gonna load until february

*boot

#

i might also eventually test this on my laptop

#

which has the original NIC that obos has ever had a driver for

#

meme

flint idol Jan 29, 2026, 5:40 AM

#

flint idol i might also eventually test this on my laptop

reason why i say eventually is because

#

this laptop is running on hopes and dreams

dense vigil Jan 29, 2026, 5:41 AM

#

flint idol this laptop is running on hopes and dreams

hopes AND dreams

#

trl

#

god undertale and deltarune are so good

#

obos deltarune port when

flint idol Jan 29, 2026, 5:43 AM

#

this laptop's ethernet port is extremely damaged

dense vigil Jan 29, 2026, 5:44 AM

#

make a wifi driver

flint idol Jan 29, 2026, 5:45 AM

#

trl

#

if only i had like a usb driver and a usb nic

#

i could use

dense vigil Jan 29, 2026, 5:46 AM

#

usb you say

#

XHCI you say

#

tro

flint idol Jan 29, 2026, 5:46 AM

#

clear

#

oops

#

this isnt my terminal

dense vigil Jan 29, 2026, 5:46 AM

#

it is mine now

flint idol Jan 29, 2026, 5:46 AM

#

i swear this ethernet port is in a quantum superposition

#

IS THE INTERFACE DOWN OR UP AHHHH

dense vigil Jan 29, 2026, 5:47 AM

#

sudo claude "make xhci driver pls thank u"

flint idol Jan 29, 2026, 5:47 AM

#

lol

#

TCP over USB

dense vigil Jan 29, 2026, 5:47 AM

#

TCP over display port

flint idol Jan 29, 2026, 5:49 AM

#

yeah this laptop is dead 💀

dense vigil Jan 29, 2026, 5:49 AM

#

rip laptop

flint idol Jan 29, 2026, 5:49 AM

#

i have another test subject but it needs an external display

dense vigil Jan 29, 2026, 5:49 AM

#

use a tv

flint idol Jan 29, 2026, 5:49 AM

#

flint idol yeah this laptop is dead 💀

this thing is no longer running on hopes and dreams

dense vigil Jan 29, 2026, 5:49 AM

#

flint idol this thing is no longer running on hopes and dreams

you must of done a neural route

flint idol Jan 29, 2026, 5:49 AM

#

dense vigil use a tv

yeah just let me just fetch my tv from the living room

knotty totem Jan 29, 2026, 5:50 AM

#

flint idol TCP over USB

that's just USB CDC-NCM

dense vigil Jan 29, 2026, 5:50 AM

#

you need to go back and date alphys and goto the true lab

knotty totem Jan 29, 2026, 5:50 AM

#

and actually it's ethernet over usb

flint idol Jan 29, 2026, 5:50 AM

#

dense vigil you need to go back and date alphys and goto the true lab

ohhhh

#

ok

#

i do also have another test subject but it's in the basement (scary)

#

evalyn can u send me a display port cable trl

#

my mailing address is 4 york st toronto, ontario trl

dense vigil Jan 29, 2026, 5:51 AM

#

also btw if you play terraria alone before going to hard mode make sure to block off the evil biomes because that will make them spresd like c razy and fuck up your works tro

dense vigil Jan 29, 2026, 5:52 AM

#

flint idol evalyn can u send me a display port cable <:trl:829316641191886888>

i stole all my from my mom

#

i only have two at all

#

trl

flint idol Jan 29, 2026, 5:52 AM

#

uh we should probably go to sleep our speech is becoming non-coherent

dense vigil Jan 29, 2026, 5:52 AM

#

dense vigil i stole all my from my mom

came with her work monitors i also took because the companies never asked to return them

flint idol Jan 29, 2026, 5:52 AM

#

lol

dense vigil Jan 29, 2026, 5:52 AM

#

thats why i have 3 decent IPS 1080p moitors for my setup

flint idol Jan 29, 2026, 5:53 AM

#

if i unplug my pc from my monitor i could use that display port cable

dense vigil Jan 29, 2026, 5:53 AM

#

only 75 and 60hz tho

flint idol Jan 29, 2026, 5:53 AM

#

flint idol if i unplug my pc from my monitor i could use that display port cable

but that's a whole lotta work icl

dense vigil Jan 29, 2026, 5:53 AM

#

but we must test

flint idol Jan 29, 2026, 5:54 AM

#

ill implement the x2apic and test it on my pc trl

dense vigil Jan 29, 2026, 5:54 AM

#

trl

#

x2 apic is easy

#

btw

flint idol Jan 29, 2026, 5:55 AM

#

yeah i just havent gotten to it yet

#

theoretically, obos is compatible with the RTL8125

dense vigil Jan 29, 2026, 5:55 AM

#

does that work with 09:00.0 Network controller: Realtek Semiconductor Co., Ltd. RTL8852BE PCIe 802.11ax Wireless Network Controller

#

wait no

#

thats my wifi

#

trl

#

0a:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8211/8411 PCI Express Gigabit Ethernet Controller (rev 15)

#

this one lmfao

flint idol Jan 29, 2026, 5:56 AM

#

what's the device id + class code + subclass + prog if

dense vigil Jan 29, 2026, 5:56 AM

#

how do i check

flint idol Jan 29, 2026, 5:56 AM

#

lspci -v

#

er no

#

i forgor

#

u need to go through sysfs

#

cat /sys/bus/pci/devices/location here/device

#

obos only tries to initialize these device ids, so ig it's incompatible

static uint16_t device_ids[] = {
    0x8161,
    0x8168,
    0x8169,
    0x8136,
};```

#

and out of the 4, it's only been tested on the RTL 8169

#

if i could i would support all realtek cards that fall under the 'r8169' linux driver

#

but i am too lazy and there is no way to test it and no reward

dense vigil Jan 29, 2026, 6:00 AM

#

flint idol obos only tries to initialize these device ids, so ig it's incompatible ```c sta...

evalyn@EvalynPC  ~  cat /sys/bus/pci/devices/0000:0a:00.0/device
0x8168

flint idol Jan 29, 2026, 6:00 AM

#

it is supported then

dense vigil Jan 29, 2026, 6:00 AM

#

sick

flint idol Jan 29, 2026, 6:01 AM

#

flint idol obos only tries to initialize these device ids, so ig it's incompatible ```c sta...

i know for a fact it works on the rtl8136

#

as that is my laptop's NIC which is what i used to test the obos network stack before i added the e1000 driver

dense vigil Jan 29, 2026, 6:05 AM

#

btw fuck whoever made IOMMU group 15 on my desktop

#

PSP1G_pspTrollar

#

it has BOTH my nvmes and my network card and wifi card and the sata ports and the XHCI controller

flint idol Jan 29, 2026, 6:08 AM

#

lmao

dense vigil Jan 29, 2026, 6:09 AM

#

this is also partly why i want an HEDT board so the IOMMU groups are good 🙏

flint idol Jan 29, 2026, 6:12 AM

#

well the driver definitely initializes the device

#

when i do passthrough

#

but that's just about it

flint idol Jan 29, 2026, 9:49 PM

#

i think something i could do to optimize tcp performance is to decrease copying

#

and allocation

#

currently Net_TCPPushReceivedData copies the received data into the intermediate buffer

#

and then if it sends an ACK it copies all the data in the intermediate buffer into a dynamically reallocated buffer for the tcp socket implementation to read

#

which might not be ideal

#

as allocation is quite inefficient (if you ask me)

#

also the window seems to become full quite often

#

the rx window

dense vigil Jan 29, 2026, 10:01 PM

#

how large is that buffer for the nic?

flint idol Jan 29, 2026, 10:03 PM

#

nic has absolutely nothin to do with rx window

dense vigil Jan 29, 2026, 10:03 PM

#

ahh

flint idol Jan 29, 2026, 10:04 PM

#

rx window being full means the peer thinks that it cant send anymore data

dense vigil Jan 29, 2026, 10:04 PM

#

ahhh

flint idol Jan 29, 2026, 10:05 PM

#

and it seems like that's happening as obos isn't sending ACKs fast enough

dense vigil Jan 29, 2026, 10:05 PM

#

also i finished up on this one trl

flint idol Jan 29, 2026, 10:05 PM

#

loll

dense vigil Jan 29, 2026, 10:06 PM

#

flint idol and it seems like that's happening as obos isn't sending ACKs fast enough

Does that also have to do with all the extra ACKs?

flint idol Jan 29, 2026, 10:07 PM

#

the extra ACKs is because I dont really know how to delay ACKs properly so i just send ACKs as soon as possible

#

and they aren't extra ACKs, per se

#

they are just ACKs that could be put into one ACK packet

dense vigil Jan 29, 2026, 10:08 PM

#

Ahh

#

What about the 4 byte packets

dense vigil Jan 29, 2026, 10:09 PM

#

flint idol the extra ACKs is because I dont really know how to delay ACKs properly so i jus...

Why not have an ACK queue that when it gets full or after a delay it flushes them into one ACK packet?

#

So you get a packet and add it to the queue or check if it hasn’t been flushed in long enough

flint idol Jan 29, 2026, 10:09 PM

#

dense vigil What about the 4 byte packets

no clue why that's happening, im just discarding them now

flint idol Jan 29, 2026, 10:10 PM

#

dense vigil Why not have an ACK queue that when it gets full or after a delay it flushes the...

the solution is to know if the NIC has any more TCP packets for this connection

#

but im not quite a fan of that solution

dense vigil Jan 29, 2026, 10:10 PM

#

true

flint idol Jan 29, 2026, 10:10 PM

#

i could probably have an ACK timer

#

but i tried that and it was slower

dense vigil Jan 29, 2026, 10:11 PM

#

What about an ACK timer and an ACK limit

flint idol Jan 29, 2026, 10:11 PM

#

because that makes no sense

dense vigil Jan 29, 2026, 10:11 PM

#

So you send a packet after every X packets or on a timer

#

true

dense vigil Jan 29, 2026, 10:11 PM

#

flint idol but im not quite a fan of that solution

Why not though?

flint idol Jan 29, 2026, 10:11 PM

#

i "fixed" the closed windows

flint idol Jan 29, 2026, 10:12 PM

#

dense vigil Why not though?

too much work

flint idol Jan 29, 2026, 10:12 PM

#

flint idol i "fixed" the closed windows

it sends ACKs before trying to queue data in the buffer

#

now

#

another probable problem is that the kernel is just slow

#

or scheduling policies are not being fair to the network stack

dense vigil Jan 29, 2026, 10:20 PM

#

flint idol or scheduling policies are not being fair to the network stack

Why not give the network stack say 300/1000ms runtime rest be damned to test it

flint idol Jan 29, 2026, 10:26 PM

#

dense vigil Why not give the network stack say 300/1000ms runtime rest be damned to test it

because curl still needs time to run

flint idol Jan 29, 2026, 10:27 PM

#

flint idol i could probably have an ACK timer

WAIT I HAVE AN IDEA

#

ill have the nic have a queue of connections that need an ACK sent on them

#

and after the network stack is done processing currently available packets

#

it will go through that queue and ACK everything

dense vigil Jan 29, 2026, 10:30 PM

#

flint idol WAIT I HAVE AN IDEA

https://tenor.com/view/spongebob-idea-have-angel-mr-gif-22114962

Tenor

#

that could work

dense vigil Jan 29, 2026, 10:31 PM

#

flint idol because `curl` still needs time to run

give curl another 300/1000 slice amd starve the rest of the system trl

flint idol Jan 29, 2026, 10:38 PM

#

nah i got a better idea

#

im gonna go microoptimize stuff

dense vigil Jan 29, 2026, 10:38 PM

#

how micro we talkin?

flint idol Jan 29, 2026, 10:38 PM

#

very

dense vigil Jan 29, 2026, 10:39 PM

#

uOPS level?

flint idol Jan 29, 2026, 10:39 PM

#

maybe

dense vigil Jan 29, 2026, 10:39 PM

#

https://uops.info/table.html

#

you will need this then

flint idol Jan 29, 2026, 10:40 PM

#

im about to remove essentially every sanity check in critical paths

#

checks like if (!list) return OBOS_STATUS_INVALID_ARGUMENT;

#

or smth

dense vigil Jan 29, 2026, 10:41 PM

#

what happens when thoes fail?

flint idol Jan 29, 2026, 10:41 PM

#

a page fault

dense vigil Jan 29, 2026, 10:41 PM

#

Can you prevent them elsewhere?

flint idol Jan 29, 2026, 10:41 PM

#

maybe idk

dense vigil Jan 29, 2026, 10:41 PM

#

Also how does your copy to userspace look like trl

#

I heard you manually checked all the page tables right

flint idol Jan 29, 2026, 10:42 PM

#

dense vigil Also how does your copy to userspace look like <:trl:829316641191886888>

not used for read-like syscalls

flint idol Jan 29, 2026, 10:42 PM

#

dense vigil I heard you manually checked all the page tables right

yeah probably because i told you KEKW

dense vigil Jan 29, 2026, 10:42 PM

#

flint idol not used for `read`-like syscalls

Wdym?

flint idol Jan 29, 2026, 10:42 PM

#

user memcpy is not used for syscalls like read

dense vigil Jan 29, 2026, 10:42 PM

#

flint idol yeah probably because i told you <:KEKW:913708372329644042>

PSP1G_pspTrollar

dense vigil Jan 29, 2026, 10:43 PM

#

flint idol user memcpy is not used for syscalls like `read`

Yes but like how does the data get to userspace then

flint idol Jan 29, 2026, 10:43 PM

#

    status = OBOS_STATUS_SUCCESS;
    void* kbuf = Mm_MapViewOfUserMemory(CoreS_GetCPULocalPtr()->currentContext, (void*)buf, nullptr, nBytes, 0, true, &status);
    if (obos_is_error(status))
        return status;

    size_t nRead_ = 0;
    status = Vfs_FdRead(fd->un.fd, kbuf, nBytes, &nRead_);

    if (nRead)
        memcpy_k_to_usr(nRead, &nRead_, sizeof(size_t));

    if (obos_is_error(status))
    {
        Mm_VirtualMemoryFree(&Mm_KernelContext, kbuf, nBytes);
        return status;
    }

    Mm_VirtualMemoryFree(&Mm_KernelContext, kbuf, nBytes);```

#

it maps a "view" of the user buffer

#

then it does the read

#

and then it returns

#

and it's as shrimple as that™

dense vigil Jan 29, 2026, 10:44 PM

#

This seems slow PSP1G_pspTrollar

flint idol Jan 29, 2026, 10:44 PM

#

who knows

#

(it definitely is)

dense vigil Jan 29, 2026, 10:44 PM

#

Why don’t you try my fancy cool method

#

That’s faster

#

And maybe help the TCP stack

#

PSP1G_pspTrollar

flint idol Jan 29, 2026, 10:44 PM

#

dense vigil Why don’t you try my fancy cool method

because KPTI

dense vigil Jan 29, 2026, 10:44 PM

#

Huh?

flint idol Jan 29, 2026, 10:45 PM

#

kernel page table isolation?

#

user page tables do not contain any kernel page tables

dense vigil Jan 29, 2026, 10:45 PM

#

How does that work

flint idol Jan 29, 2026, 10:45 PM

#

except for the bare minimum for a context switch into kernel mode

#

context switch meaning IRQ or syscall

dense vigil Jan 29, 2026, 10:45 PM

#

True

flint idol Jan 29, 2026, 10:46 PM

#

e.g., the isr stubs or syscall trap handler are mapped

#

but not driver code

#

or anything else

#

        memzero(Arch_MapToHHDM(cached_root), OBOS_PAGE_SIZE);
        // Map the ISR handlers.
        map_range(cached_root, (uintptr_t)&Arch_StartISRHandlersText, (uintptr_t)&Arch_EndISRHandlersText, BIT(0));
        // Map Arch_KernelCR3
        map_range(cached_root, (uintptr_t)&Arch_KernelCR3, (uintptr_t)(&Arch_KernelCR3 + 1), BIT(0) | BIT_TYPE(63, UL));
        // Map CoreS_SwitchToThreadContext
        map_range(cached_root, (uintptr_t)&CoreS_SwitchToThreadContext, (uintptr_t)&CoreS_SwitchToThreadContextEnd, BIT(0));
        // Map kernel stacks.
        for (size_t i = 0; i < Core_CpuCount; i++)
        {
            cpu_local* const cpu = Core_CpuInfo + i;
            map_range(cached_root, (uintptr_t)cpu->arch_specific.ist_stack, (uintptr_t)cpu->arch_specific.ist_stack + 0x20000, 1|BIT_TYPE(63, UL)|2);
        }
        // Map cpu local structs.
        map_range(cached_root, (uintptr_t)Core_CpuInfo, (uintptr_t)(Core_CpuInfo + Core_CpuCount), 1|BIT_TYPE(63, UL)|2);
        // Map IDT
        extern struct idtEntry g_idtEntries[256];
        map_range(cached_root, (uintptr_t)&g_idtEntries, ((uintptr_t)&g_idtEntries) + 0x1000, 1|BIT_TYPE(63, UL)|2);
        extern uintptr_t Arch_IRQHandlers[256];
        map_range(cached_root, (uintptr_t)&Arch_IRQHandlers, ((uintptr_t)&Arch_IRQHandlers) + sizeof(Arch_IRQHandlers), 1|BIT_TYPE(63, UL)|2);
        // Map syscall trap handler.
        extern char Arch_SyscallTrapHandlerEnd;
        extern char Arch_SyscallTrapHandler;
        map_range(cached_root, (uintptr_t)&Arch_SyscallTrapHandler, (uintptr_t)&Arch_SyscallTrapHandlerEnd, 1|2);```

#

this is the only kernel memory mapped in user mode

#

this does make any syscall or IRQ extremely slow

#

because it has to change cr3 twice

#

im gonna open the SDM and read on PCIDs

dense vigil Jan 29, 2026, 10:50 PM

#

i may not be smart

#

but this sounds really stupid

flint idol Jan 29, 2026, 10:50 PM

#

same here

#

it's not stupid with PCIDs

#

otherwise it is quite stupid

dense vigil Jan 29, 2026, 10:50 PM

#

how do PCIDs work

flint idol Jan 29, 2026, 10:50 PM

#

like very stupid

dense vigil Jan 29, 2026, 10:51 PM

#

flint idol otherwise it is quite stupid

yeah and your doing it without so tro

flint idol Jan 29, 2026, 10:51 PM

#

dense vigil how do PCIDs work

something something TLB

#

blah blah

#

x86 sdm 3a 5.10.1

#

read up

dense vigil Jan 29, 2026, 10:52 PM

#

nah id win

#

also how much secuirity does this give?

#

at all

flint idol Jan 29, 2026, 10:52 PM

#

it's a spectre/meltdown mitigation

dense vigil Jan 29, 2026, 10:53 PM

#

ahh true

flint idol Jan 29, 2026, 10:53 PM

#

also it's the only possible thing on some architectures (i.e., m68k)

dense vigil Jan 29, 2026, 10:53 PM

#

linux does it?

flint idol Jan 29, 2026, 10:53 PM

#

yes

dense vigil Jan 29, 2026, 10:53 PM

#

damn, this sounds like it will be a PITA to implement trl

flint idol Jan 29, 2026, 10:53 PM

#

flint idol also it's the only possible thing on some architectures (i.e., m68k)

the m68k has two separate page table registers

#

urp and srp

#

urp is the page table it uses while in user mode

#

and srp is the one it uses in kernel mode

#

making it theoretically only possible for the kernel to look at user memory through a view (which i already do)

#

unless of course srp and urp are always the same

dense vigil Jan 29, 2026, 10:55 PM

#

though who cares about spectre/meltdown tro

flint idol Jan 29, 2026, 10:55 PM

#

idk security nerds

#

i have no idea why i decided to do KPTI

dense vigil Jan 29, 2026, 10:55 PM

#

and without PCIDs trl

flint idol Jan 29, 2026, 10:56 PM

#

i did it without PCIDs because i had no idea what those were/didn't give enough of a fuck

#

just committed everything trl

flint idol Jan 29, 2026, 11:30 PM

#

after i merge the xhci-driver branch obos is probably gonna reach like 75k loc

#

how exciting

#

man the burning urge to rewrite major parts of the kernel

#

it's starting to get to me

dense vigil Jan 29, 2026, 11:30 PM

#

flint idol man the burning urge to rewrite major parts of the kernel

make OBOS-3

flint idol Jan 29, 2026, 11:30 PM

#

OBOS6

dense vigil Jan 29, 2026, 11:31 PM

#

OBOS69

flint idol Jan 29, 2026, 11:31 PM

#

if i were to rewrite one day i would have the exact same syscall api+abi

#

because i am too lazy to port mlibc again

dense vigil Jan 29, 2026, 11:31 PM

#

do binary compat

flint idol Jan 29, 2026, 11:31 PM

#

yeah

#

that's what i would do

dense vigil Jan 29, 2026, 11:31 PM

#

true

flint idol Jan 29, 2026, 11:31 PM

#

usermode binary compat

#

and maybe even driver binary compat

dense vigil Jan 29, 2026, 11:31 PM

#

do a micro kernel

#

call it OBOSmini

flint idol Jan 29, 2026, 11:32 PM

#

miniOBOS

dense vigil Jan 29, 2026, 11:32 PM

#

microminiOBOS

flint idol Jan 29, 2026, 11:32 PM

#

dense vigil do a micro kernel

if i wrote a slow monolithic kernel

#

then i am probably writing a really slow microkernel

dense vigil Jan 29, 2026, 11:33 PM

#

just make it fast lol

#

just set fast=true

flint idol Jan 29, 2026, 11:33 PM

#

galaxybrain

#

ok if i were to rewrite the vfs that would cost me 10k loc

#

mm: 4k loc

#

driver interface: 2.3k loc

#

scheduler and synchronization primitives: ~3k loc

#

x86_64 functions: 9k loc

#

network stack: 5k loc

#

allocator: 500 loc (the allocator is fast enough so im not too worried about it)

#

irq+timer interface: 1k loc

#

drivers: 12k loc

#

and that is everything important

#

the shittiest code quality in all of these is probably the code under arch/x86_64

#

t'was written very lazily

#

it would also be arguably the easiest to rewrite

dense vigil Jan 29, 2026, 11:37 PM

#

maybe if you make a new kernel dont go for a m68k port too?

flint idol Jan 29, 2026, 11:37 PM

#

probably

dense vigil Jan 29, 2026, 11:37 PM

#

my plan was to do a seperate 32bit kernel forked off my main one

flint idol Jan 29, 2026, 11:37 PM

#

the m68k port is very unmaintained

#

idk if it even builds rn

dense vigil Jan 29, 2026, 11:37 PM

#

my kernels internal name is gonna be called kernel

#

and the 32bit one woll be kernel32

flint idol Jan 29, 2026, 11:38 PM

#

ic

dense vigil Jan 29, 2026, 11:38 PM

#

as seperate will mean they can be better optimized for the bit shite

flint idol Jan 29, 2026, 11:38 PM

#

ic

dense vigil Jan 29, 2026, 11:38 PM

#

like HHDM things?

#

i use that heavily

flint idol Jan 29, 2026, 11:38 PM

#

u should not be using HHDM enough that it is impossible to stop using it

dense vigil Jan 29, 2026, 11:38 PM

#

trl

#

maube

flint idol Jan 29, 2026, 11:39 PM

#

dense vigil <:trl:829316641191886888>

evalyn so should i do a rewrite of all x86_64 specific code

#

it's your choice how i decide to waste the next 4 days

dense vigil Jan 29, 2026, 11:39 PM

#

let me see how bad it is first

flint idol Jan 29, 2026, 11:39 PM

#

kk

#

i say it's quite bad

#

not for any reason i just have a hunch

dense vigil Jan 29, 2026, 11:41 PM

#

https://tenor.com/view/steamed-hams-aurora-borealis-what-is-happening-fagetti-wtf-gif-16514726

Tenor

#

https://github.com/OBOS-dev/obos/blob/master/src/oboskrnl/arch/x86_64/map.c

#

https://github.com/OBOS-dev/obos/blob/master/src/oboskrnl/arch/x86_64/isr.asm

#

what is this 🙏

#

https://git.evalyngoemer.com/evalynOS/evalynOS/src/branch/dev/src/kernel/interupts/interupts.asm

Evalyn's Git Server

evalynOS/src/kernel/interupts/interupts.asm at dev

#

look at how nice this is

#

but @flint idol you know what id rather you do

#

flint idol Jan 29, 2026, 11:47 PM

#

dense vigil what is this 🙏

lmao

#

huh what's wrong with my isr stub code?

dense vigil Jan 29, 2026, 11:47 PM

#

it just looks messy

#

imo

flint idol Jan 29, 2026, 11:48 PM

#

https://tenor.com/view/green-goblin-gif-14141276552966470862

Tenor

dense vigil Jan 29, 2026, 11:48 PM

#

okay but look at mine

#

and look my into my eyes

#

and say mine is more messy

#

🙏

flint idol Jan 29, 2026, 11:49 PM

#

dense vigil okay but look at mine

u dont have to use all 256 vectors

dense vigil Jan 29, 2026, 11:49 PM

#

i dont

flint idol Jan 29, 2026, 11:49 PM

#

yeah

#

but i do

#

and you dont swapgs

#

and you dont have to switch cr3

dense vigil Jan 29, 2026, 11:49 PM

#

i do that elsewhere

#

trl

flint idol Jan 29, 2026, 11:50 PM

#

i do it all in asm because why would i make the C code do that

#

and add a layer of indirection

dense vigil Jan 29, 2026, 11:50 PM

#

flint idol and you dont have to switch `cr3`

true i dont always have to but thats a quick check

dense vigil Jan 29, 2026, 11:50 PM

#

flint idol and add a layer of indirection

hm?

#

you mean the switch case

#

and use a table?

#

i have plans to do that

flint idol Jan 29, 2026, 11:50 PM

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no i mean the whole dispatch_interupt

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yeah

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until you do

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speak not about "messy code"

dense vigil Jan 29, 2026, 11:51 PM

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talk cheap send patches

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trl

flint idol Jan 29, 2026, 11:51 PM

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no u

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u called my code messy

dense vigil Jan 29, 2026, 11:51 PM

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true

flint idol Jan 29, 2026, 11:51 PM

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and compared it to your code

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when your code does less

dense vigil Jan 29, 2026, 11:51 PM

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okay give me a list of stuff mine is missing

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and il implement it

flint idol Jan 29, 2026, 11:51 PM

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dense vigil and use a table?

^

dense vigil Jan 29, 2026, 11:52 PM

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okay il use a table

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anything else boss

flint idol Jan 29, 2026, 11:52 PM

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swapgs in asm

dense vigil Jan 29, 2026, 11:52 PM

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alright

flint idol Jan 29, 2026, 11:52 PM

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🥀 is your kernel not architecture-separated

dense vigil Jan 29, 2026, 11:52 PM

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its somewhat 🥀

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but i need to work on that

#OBOS (not vibecoded)