#DPC latency spikes with applications with start-stop render loops (Arc A750)

7 messages · Page 1 of 1 (latest)

near ledge
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Applications such as Blender or the Unity editor pause their render loops when the user is not directly interacting with them, then spin them back up when the user, say, drags the mouse to move the camera.

This stop-start seems to cause a large DPC latency spike with both the current stable 3490 and beta 3491 drivers which is very disruptive to other hardware, for example the Focusrite Scarlett range of audio interfaces (which are popular with gamers for their microphone inputs) which cut out for 5+ seconds each time one of these spikes occurs (LatencyMon screenshot attached).

OS Name    Microsoft Windows 11 Home
Version    10.0.22621 Build 22621
OS Manufacturer    Microsoft Corporation
System Manufacturer    ASUS
System Model    System Product Name
System Type    x64-based PC
System SKU    SKU
Processor    12th Gen Intel(R) Core(TM) i5-12400F, 2500 Mhz, 6 Core(s), 12 Logical Processor(s)
BIOS Version/Date    American Megatrends Inc. 2002, 24/08/2022
SMBIOS Version    3.4
Embedded Controller Version    255.255
BIOS Mode    UEFI
BaseBoard Manufacturer    ASUSTeK COMPUTER INC.
BaseBoard Product    PRIME Z690-P
BaseBoard Version    Rev 1.xx
Platform Role    Desktop
Secure Boot State    Off
PCR7 Configuration    Elevation Required to View
Windows Directory    C:\WINDOWS
System Directory    C:\WINDOWS\system32
Boot Device    \Device\HarddiskVolume1
Locale    United Kingdom
Hardware Abstraction Layer    Version = "10.0.22621.1"
Time Zone    GMT Summer Time
Installed Physical Memory (RAM)    16.0 GB
Total Physical Memory    15.8 GB
Available Physical Memory    4.19 GB
Total Virtual Memory    28.6 GB
Available Virtual Memory    4.87 GB
Page File Space    12.7 GB
Virtualisation-based security    Not enabled
Windows Defender Application Control policy    Enforced
Windows Defender Application Control user mode policy    Audit
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wheat lotus
#

Did you find any solution in the meantime?

near ledge
#

None, I'm just using a different sound card for now.

wheat lotus
near ledge
#

I'm using an onboard one. It still crackles a little occasionally but it doesn't cut out entirely like the Focusrite.

If I've got something running which keeps a steady render loop going (e.g. a simple game) the issue goes away as well - just seems to be blocking the DPC queue while transitioning between power states or something.

wheat lotus
#

Yeah i also noticed that - if you have a rather steady load on the GPU, the issue does not seem to be that noticeable - but in my case it is even enough if I use hardware acceleration in my browser and open some new tabs while browsing -> enough for these mini sound dropouts/artifacts with my Creative Katana V2