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How to get the cause of high CPU usage by DPC / Interrupt

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#1401
BeauS

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Hello Andre, as i mentioned in pm. just a quick summary, ive been having some issues with dpc latency causing some audio popping and stutter while gaming. ive searched all over the web for a solution to this. i have run latency mon and the main drivers at the top of the list are usually nvidia drivers, directx, usbport.sys, ataport.sys, tcpip.sys, etc. the issues im having primarily show up when i am playing a game and mostly while playing in nvidia surround mode on 3 Asus monitors. should i do the trace while im gaming or should i do it while my pc is idle or should i get a trace of both for you to review to help me isolate the issue?




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#1402
MagicAndre1981

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capture 2 traces (one idle and one during gaming) so that I can compare them.


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#1403
MagicAndre1981

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the idle trace shows some DPC issues caused by the nVIDIA GPU driver:


Total = 50848 for module nvlddmkm.sys
Elapsed Time, >        0 usecs AND <=        1 usecs,    903, or   1.78%
Elapsed Time, >        1 usecs AND <=        2 usecs,   8468, or  16.65%
Elapsed Time, >        2 usecs AND <=        4 usecs,  10120, or  19.90%
Elapsed Time, >        4 usecs AND <=        8 usecs,   7422, or  14.60%
Elapsed Time, >        8 usecs AND <=       16 usecs,  17104, or  33.64%
Elapsed Time, >       16 usecs AND <=       32 usecs,   5847, or  11.50%
Elapsed Time, >       32 usecs AND <=       64 usecs,    678, or   1.33%
Elapsed Time, >       64 usecs AND <=      128 usecs,     29, or   0.06%
Elapsed Time, >      128 usecs AND <=      256 usecs,      0, or   0.00%
Elapsed Time, >      256 usecs AND <=      512 usecs,    271, or   0.53%
Elapsed Time, >      512 usecs AND <=     1024 usecs,      6, or   0.01%
Total,                                                 50848

In the gaming the Spikes of the nVIDIA driver are larger.

 

You still use the 337.88 driver, try the 340.52:

 

http://www.nvidia.co...spx/77224/en-us

 

and look if this improves it.


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#1404
doveman

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I've just done a fresh install of Win 8.1 Update 1 x64 on another system, AMD not Intel this time and have the same issue with ndis.sys causing massive latency spikes when in Balanced mode, which is fixed by running in High Performance mode, so it seems a common issue across all platforms when using power saving features.

 

I guess if playing an online video is enough to keep the CPU in High Power state then it won't cause any problems but if it's fluctuating between states (and certainly a youtube video shouldn't need a 4-core 4670k to run at 3.8Ghz (or 4.4Ghz overclocked), it seems bound to cause audio issues, so probably the only solution is to run in High Performance mode all the time and be more aggressive about putting the PC in standby to offset the increased power usage.






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