Hi,
since I have build my new PC two years ago, I am experiencing high DPC latency when audio / video and mouse are glitching / lagging.
The problem is that this issue looks like application specific and no stress test (CPU/GPU) is able to reproduce the DPC issue.
After power-on, restart, hibernation, during normal work, playing movies / music it never happens and DPC latency is OK.
It usually happens in games after very long time (Battlefield 3, Far Cry 4) but in some games (like Flight Simulator, where you fly for hours) it never happens.
Recently I have started to play Project Reality (Battlefield 2 mod) which is not very demanding game, but Mumble is used, and I get this DPC latency issue after 20 minutes.
If I ignore DPC latency and continue working with PC, after some time I will get BSOD.
If I hibernate PC (RAM to HDD) it will fix the problem.
Thanks to this forum I downloaded Windows Performace Analyzer in hope I will find some clue which driver is causing this behavior.
But I got this:
So you can see that driver / module is "?"
Program called LatencyMon was not even able to recognize the "?":
Highest DPC routine execution time (µs): 4110,366471
Driver with highest DPC routine execution time:
Highest reported total DPC routine time (%): 1,438099
Driver with highest DPC total execution time:
Total time spent in DPCs (%) 1,650238
DPC count (execution time <250 µs): 19617861
DPC count (execution time 250-500 µs): 0
DPC count (execution time 500-999 µs): 129393
DPC count (execution time 1000-1999 µs): 1583
DPC count (execution time 2000-3999 µs): 154
DPC count (execution time >=4000 µs): 0
I dont have any unknown device in Device Managers, or warnings so on. Disabling / enabling antivirus (Avast) or firewall (Comodo) is not effective.
I regulary update BIOS and system if available.
I have no clue what to check next.
Could you please advise where to look next?
Thanks
Tomas
