DPC Latency Test on Win 8 Pro RTM x64 with nVidia 304.79 Beta

Discussion in 'Windows 8' started by xscess, Aug 6, 2012.

  1. JamesG269

    JamesG269 MDL Novice

    Dec 16, 2011
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    Latency Monitor has severe issues. For instance, it tells me 10µs when I run it..then I close gmail notifier pro, an email program, and the latency in Latency Monitor goes up to 1000µs and stays there indefinitely. This is repeatable even after a reboot. DPC Latency Checker seems to make much more sense, I disable things that run in the background and hit the disk, and the DPC LC shows decreased latency, I open a program and it stays the same or gets higher, not I open my email program and it decreases 100x...
     
  2. artins90

    artins90 MDL Novice

    Aug 3, 2012
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    I did some more testing with DX11 Heaven benchmark I thought you might be interested:

    2500k stock frequency
    HD 5850
    Gene-z gen3
    Corsair Vengeance 2x4GB 1600

    1920x1080
    Tessellation Normal
    Shader Quality High
    AF 16x
    AA Disabled

    Win8
    Score 879
    Avg FPS 34.6
    Max FPS 83.9
    Min FPS 9.8

    Win7

    Score 885
    Avg FPS 35.1
    Max FPS 84.6
    Min FPS 9.7
     
  3. artins90

    artins90 MDL Novice

    Aug 3, 2012
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    #23 artins90, Aug 12, 2012
    Last edited by a moderator: Apr 20, 2017
    I found a fix to this problem now I have 30 stable Windows 8 > Windows 7 DPC latency wise.

    Here is the fix you need to reboot after applying it

    Code:
    bcdedit /set disabledynamictick yes
     
  4. vcfan

    vcfan MDL Novice

    Aug 11, 2012
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    these dpc checkers are useless in windows 8 as the architecture is different. first of all,all the interrupts are routed to 1 unique interrupt,and the dpcs are run at a constant time interval. also audio is given higher priority so it doesnt need to be passed to a dpc. in fact, audio has less latency and runs much better than windows 7. even cakewalk who makes professional audio editing suites (sonar) determined they got better audio performance and less latency in windows 8 than windows 7.
     
  5. DaveMurray

    DaveMurray MDL Junior Member

    Apr 18, 2009
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    #25 DaveMurray, Aug 13, 2012
    Last edited by a moderator: Apr 20, 2017
    not working for me, im still in 1000ms latency. My mainboard is Gigabyte 990FXA-UD5, with AMD FX 8150 and Palit Nvidia Geforce GT 430. (ddr3 64bit version, im not gamer...)
     
  6. Camazza

    Camazza MDL Member

    Oct 8, 2007
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    SOURCE: The people who make DPC Latency Checker. 'nuff said
     
  7. DaveMurray

    DaveMurray MDL Junior Member

    Apr 18, 2009
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    thanks Camazza, it was useful quote :) so we waiting for the new version :)
     
  8. Camazza

    Camazza MDL Member

    Oct 8, 2007
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    You're welcome. I wouldn't care about DPC anyway. I work with audio software all the time and Win8 behaves as good if not better than Win7. Say hi to Bruce and Nicko for me ;)
     
  9. artins90

    artins90 MDL Novice

    Aug 3, 2012
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    My PC behaved like in this video I made: youtube.co m/watch?v=Zys_zBlQtJY maybe your problem is different I had high dpc only when my PC was idle or near idle (CPU at 20-30%)
     
  10. JamesG269

    JamesG269 MDL Novice

    Dec 16, 2011
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    #31 JamesG269, Aug 20, 2012
    Last edited by a moderator: Apr 20, 2017
    Good find. Lowered my latency in Latency Monitor to 4-6 microseconds, I guess the issue I was having with the latency being high when no programs were running was caused by this dynamictick setting, can't really notice a difference in speed (vs. the 900 microsecond at idle I previously had) but I'm happy anyway. :biggrin:
     
  11. Espionage724

    Espionage724 MDL Expert

    Nov 7, 2009
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    #32 Espionage724, Aug 20, 2012
    Last edited by a moderator: Apr 20, 2017
    Source? Not that I don't believe you or not, but I would like to have an official source if I choose to link this information somewhere.
    Is there any official word as to what this does exactly?
     
  12. prease

    prease MDL Novice

    Aug 2, 2012
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    disables the windows cpu power management underclocking\undervolting i believe
     
  13. dsbig

    dsbig MDL Senior Member

    Aug 3, 2009
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    #34 dsbig, Aug 20, 2012
    Last edited: Aug 20, 2012
    from what I read, dynamic tick make it so the cpu stays more idle...less drain on laptop batterys.

    windows 7 had it too but seems there is some bugs in windows 8 version of it.
    it seems windows 8 version is causing lag in the cpu..

    but I tried the disable thing on mine but it is still at 1000us

    I also decided to use the bcdedit /set useplatformclock true to help even it out.