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The DPC Latency Test Thread (AMD/Nvidia) - Page 4

post #31 of 39
Thread Starter 
Quote:
Originally Posted by Brutuz View Post

(Bit of a bump, but oh well it's information)
Excessive DPC latency is mainly caused by generally bad ethernet drivers, and in some cases audio drivers. (For example, I run custom drivers for my Xonar DX to lower DPC latency.)
My system appears to by dying; one of the symptoms is excessive DPC latency too; during games it's not that bad but if I even have a slow download going or something similar (Or a fast download via Steam) then I end up literally getting DPC latencies over 1,000,000us (I'm not kidding) which manifests itself as a system wide pause.

Thank you for your information.
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post #32 of 39
Hai guys (and gals?)
I'm intopro audio so I need really, really, really, tremendously low DPC latency readings (because else it adds pops and crackles when recording, which is utterly non-desirable).

With an el cheapo passive 30$ graphic card I have a DPC latency between 5 and 9 µS.
However, with the GTX690 (I play a bit, too ^__^) it jumps up to something around 700 µS.
I noticed that when I changed something into the SLI parameters, for instance going from "3d performance" or "every monitor" to "sli disabled" it would get back to normal low values for 6, 7 seconds and then get up again, in whichever setting I end.

Also, disabling one of the two GPUs directly in the windows peripheral manager has the effect of cutting the dpc latency a bit, meaning the peaks are @ 400 µS.

Do you think it will be solved ? Because I'd like not to have to open my case to plug in the gTX690 every time I want to play...

Thanks =)
post #33 of 39
I just want to direct you guys to this thread: http://www.overclock.net/t/1310726/things-ive-noticed-that-alter-mouse-movement-that-nobody-talks-about

TL:DR

Lower memory timings, disable C states/PWM Control, disable High Precision Event Timer

In my heaven test max DPC latency was 109, still tweaking before I post my final results. Before tweaking the things I mentioned I was getting 500-600 DPC latency

1600Mhz 8-8-8-21 1T has lower DPC latency than 2133 10-10-10-28 1T
    
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post #34 of 39
Didn't know about memory timings but that makes sense, C States/PWM and HPET are known though, there's a great guide somewhere on Guru3D.
    
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post #35 of 39
Quote:
Originally Posted by Scorpion667 View Post

I just want to direct you guys to this thread: http://www.overclock.net/t/1310726/things-ive-noticed-that-alter-mouse-movement-that-nobody-talks-about
TL:DR
Lower memory timings, disable C states/PWM Control, disable High Precision Event Timer
In my heaven test max DPC latency was 109, still tweaking before I post my final results. Before tweaking the things I mentioned I was getting 500-600 DPC latency
1600Mhz 8-8-8-21 1T has lower DPC latency than 2133 10-10-10-28 1T

Well, for my part, the latest nvidia driver made the trick, when I disable the second GPU I get back to < 10µS DPC lat.
(everything you said, disabling the C States, etc... Was of course done since the very beginning smile.gif )

However, I'll give a shot to the RAM CAS latency, for now I'm at 1866 Mhz and 9 - 9 - 9 - 27 timings. I'm just afraid that my mobo (a poor man's ga-p67a-ud3p) won't allow me to change the timings too deeply...
post #36 of 39
Thread Starter 
What does High Precision Event Timer do? In simple terms please?
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post #37 of 39
Essentially a timer that never stops, I think because of the way it works it can cause a lot of latency while being a lot more precise than the former methods used such as the RTC (Real Time Clock)
    
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post #38 of 39
big thanks for making this thread, so i can compare my results, it seems that my results are way to high i get over 1000µ using UniXonar 1.71 drivers (low latency) on my DX card :/
    
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post #39 of 39
Quote:
Originally Posted by wiak View Post

big thanks for making this thread, so i can compare my results, it seems that my results are way to high i get over 1000µ using UniXonar 1.71 drivers (low latency) on my DX card :/

Windows 8 results are way off.
Quote:
Windows 8 Compatibility: The DPC latency utility runs on Windows 8 but does not show correct values. The output suggests that the Windows 8 kernel performs badly and introduces a constant latency of one millisecond, which is not the case in practice. DPCs in the Windows 8 kernel behave identical to Windows 7. The utility produces incorrect results because the implementation of kernel timers has changed in Windows 8, which causes a side effect with the measuring algorithm used by the utility. Thesycon is working on a new version of the DPC latency utility and will make it available on this site as soon as it is finished.

That's a quote from the following site: http://www.thesycon.de/deu/latency_check.shtml

I had the same thing when I moved to win8, I just stopped using dpc checker altogether. tongue.gif
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