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Topic # 102692 19-May-2012 20:16 Send private message

I am having some problems with audio dropouts on a brand new Win 7 PC.  A friend suggested that I should look at DPC latency.  Sure enough, I have some DPC latency peaks occurring every 3s.  Can anyone tell me what Win 7 does every 3s?  Is it maybe a display driver?  Anything I can do to fix this?

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  Reply # 627938 20-May-2012 14:26 Send private message

Any bad driver can screw up dpc latency, first thing to do would be to update all drivers (motherboard chipset, video, audio etc).

Latency Monitor can be handy to isolate the cause, play something then measure while playing, check the process and driver tabs
http://resplendence.com/latencymon

Here is a post about using xperf to find the exact cause looks a bit more involved
http://blogs.msdn.com/b/peterwie/archive/2008/10/06/measuring-dpc-time.aspx

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