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zerowalker

Windows 8 - DPC Latency help

10 posts in this topic

I am having a bit of a problem with DPC latency.

It´s nothing really serious, but i would like to track what´s causing it.

I attached latencymon screenshots, hopefully that will help a bit.

In Latencymon it goes from 10-30 to 70-90 from time to time, like every 2-3 sec, and i don´t know why.

I tried disabling my NIC but that didn´t help.

Also tried enabling HPET, but that changed it a bit, but not for the better, and my mouse became slowish.

So i am out of ideas.

post-377362-0-34888600-1367074243_thumb.

post-377362-0-37003900-1367074251_thumb.

post-377362-0-97653700-1367074257_thumb.

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run the xperf command I posted in my topic and upload the generated .ETL file.

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you don't have nay issues with DPCs:

Total = 48160

Elapsed Time, > 0 usecs AND <= 1 usecs, 13580, or 28.20%

Elapsed Time, > 1 usecs AND <= 2 usecs, 8797, or 18.27%

Elapsed Time, > 2 usecs AND <= 4 usecs, 11869, or 24.64%

Elapsed Time, > 4 usecs AND <= 8 usecs, 8289, or 17.21%

Elapsed Time, > 8 usecs AND <= 16 usecs, 5368, or 11.15%

Elapsed Time, > 16 usecs AND <= 32 usecs, 212, or 0.44%

Elapsed Time, > 32 usecs AND <= 64 usecs, 35, or 0.07%

Elapsed Time, > 64 usecs AND <= 128 usecs, 10, or 0.02%

Total, 48160

highest values are only betwwen 64 and 128µs, this is outstanding good :)

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I will have to trace a longer time. Cause it should be worse than that from time to time. I get like 400, or something, but i don´t know from what.

And i see that people have like 10-30 normally. Mine is pretty much at 70+.

Here is another, i kept it going for a longer period this time.

http://www.sendspace.com/file/wr12ug

Thanks

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this time you had a small issue with the DX driver:

Total = 78501 for module dxgkrnl.sys

Elapsed Time, > 128 usecs AND <= 256 usecs, 12, or 0.02%

Elapsed Time, > 256 usecs AND <= 512 usecs, 4, or 0.01%

Elapsed Time, > 512 usecs AND <= 1024 usecs, 9, or 0.01%

Elapsed Time, > 1024 usecs AND <= 2048 usecs, 1, or 0.00%

Total, 78501

try the AMD Catalyst 13.4 or 13.5 Beta drivers.

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That seem to have helped.

I only seem to get DPC spikes now when i open videos some times. I guess it´s something with loading the codec or such.

But it seems to only be at the load moment, which doesn´t affect anything i think.

It can get up to 900+ it seems if i spam open.

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It can get up to 900+ it seems if i spam open.

Well then, don't do that. LOL Sorry, I couldn't help myself.

Cheers and Regards

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