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High DPC causing stuttering in VMIX
Rank: Newbie
Groups: Registered
Joined: 12/18/2023(UTC) Posts: 3 
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Hi,
I’ve been having a persistent issue with several of our vMix machines, all to a high spec (example below).
X299 motherboard, i9 18 Core Processor i9-10980XE, ASUS® ROG STRIX X299, 32GB Corsair VENGEANCE DDR4 3200MHz (4 x 8GB), GPU 16GB ASUS TUF GEFORCE RTX 4080 OC EDITION
We’ve noticed we get high render times and GPU overload warnings which result in stutters, jitters randomly throughout our productions.
Using latency mon we can see issues with high DPC latency with the drivers mentioned as issue points being: -NDIS.SYS -NTOSKRNL.EXE
Things we have tested but have made no impact on high DPC:
Enable and disable XMP
Update GPU drivers, Clean install too
Update device drivers
Update BIOS
SFC check
Chkdsk
DISM
TCP/IP.sys
Check power settings and make sure it's running as fast as possible (ACPI.sys)
Update Windows version
Enable and disable dante
Enable / disable the resizable bar and high performance as per vMix’s guidance
TCP/IP.sys (Flush DNS)
Flush kernels
Make sure RSC is enabled
Disable / enable the WIFI card and use ethernet only
Run Memory Test and no errors presented themselves -Check for IRQ conflicts
I wondered if anyone else had issues relating to these mentioned drivers / how you have been able to solve high DPC
Any suggestions would be greatly appreciated.
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Rank: Newbie
Groups: Registered
Joined: 12/18/2023(UTC) Posts: 3
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I have an update:
When uninstalling Dante Virtual Soundcard (DVS) and the Dante control software the DPC latency based on NDIS.sys has been reduced but we are still getting warnings and issues in the stream. (see attached image)
We need to use DVS as part of our workflow so not having it isn't really an option but for the sake of the test I thought it was worth trying.
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Rank: Advanced Member
Groups: Registered
Joined: 2/16/2017(UTC)
Posts: 178
Location: Denmark
Thanks: 27 times
Was thanked: 18 time(s) in 15 post(s)
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In general high DPC latency values reported by LatencyMon or DPC Latency Checker are very, very common. Many vMix reference laptops and motherboards have suffered from relatively high DPC latency values without this directly impacting normal vMix use. The best place to start is in the BIOS and specifically to turn off CPU power saving features. Next, disabling drivers (or updating them) one by one could also lead to some improvement. The issues you have with GPU overload warnings are likely not caused by high DPC latency values though, but rather a vMix project that is not correctly optimized. It could be too many videos loaded as separate inputs (instead use the list input) or something similar. If you submit a support request through vMix the team would be able to be more specific and help you.
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Rank: Newbie
Groups: Registered
Joined: 12/18/2023(UTC) Posts: 3
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Thanks for your quick reply! I've already tried BIOS level changes to no avail
Just emailed vMix support so hopefully the team can help :)
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