Windows 8 High DPC latency Fix

Discussion in 'Videocards - NVIDIA GeForce Drivers Section' started by Penal Stingray, Jan 27, 2013.

  1. Penal Stingray

    Penal Stingray Banned

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    Before this tweak im was averaging 500 now after the tweak im at 12. I was wondering why im running high dpc when I install windows 8 compare to windows 7.

    1.Run CMD with Administrator Rights and copy this bcdedit /set disabledynamictick yes

    2. And Paste it lol then press enter close the cmd restart your pooter and watch your DPC latency drop big time. u can measure ur dpc latency by downloading DPC Latency checker http://www.thesycon.de/deu/latency_check.shtml

    Benefits of low DPC is

    Stuttering is improved a lot games now rarely stutters

    Input lag improves

    Sound quality improves "maybe placebo effect but for me I notice it"

    FPS improves as well as video playback improves

    [​IMG]
     
    Last edited: Jan 27, 2013
  2. volkov956

    volkov956 Ancient Guru

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    Just some info for some on it

    disabledynamictick [ yes | no ]
    Enables and disables dynamic timer tick feature. The option is available starting with Windows 8 and Windows Server 2012.
    Note This option should only be used for debugging.

    http://msdn.microsoft.com/en-us/library/ff542202(VS.85).aspx
     
  3. Party Poison

    Party Poison Master Guru

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    whats the benefit of doing this?

    edit: nvm i just read first post properly , just ran the latency thing on mine and it was at about 1000 lol
     
    Last edited: Jan 27, 2013
  4. Penal Stingray

    Penal Stingray Banned

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    If ur dpc is already low below 20 ish no need to disable it but if ur dpc is around 500 ish which is pretty high disabling it helps big time it felt like running a different pc, games just runs butter smooth.
     

  5. WhiteLightning

    WhiteLightning Don Illuminati Staff Member

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    have you downloaded a new version of dpc latency checker ? (since it doesnt show proper values for windows 8 according to the creators).
     
  6. Party Poison

    Party Poison Master Guru

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    Ive tried the cmd command 3 times now and still no change, Anyidea why folks?
     
  7. -Tj-

    -Tj- Ancient Guru

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    Same here and it didnt budge even after this "tweak"..


    LatencyMon shows a different story (all ok).


    From what i saw Latency DPC isnt compatible with win8 anyway.
     
  8. Vbs

    Vbs Master Guru

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    http://www.thesycon.de/eng/latency_check.shtml
     
  9. lucidus

    lucidus Ancient Guru

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    He's just pulling your legs again. DPC latency is reported inaccurately in Windows 8.
     
  10. WhiteLightning

    WhiteLightning Don Illuminati Staff Member

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    But i dont have any legs left!! :p
     

  11. Prophet

    Prophet Master Guru

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    Latencymon can report it correctly afaik.
     
  12. Mangix

    Mangix Active Member

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    ahem: http://technet.microsoft.com/en-us/sysinternals/bb897568.aspx

    DPC Latency Mon under Windows 8 shows the value that this tool also shows. The reason is that there were some kernel API changes that cause DPC Latency Mon to be fed info about the clock resolution and not about the DPCs.

    Here's a simple test you can do: Install MPC-HC as well as madVR and play a video using madVR. DPC Latency Mon should show latencies of ~500 instead of ~1000 because madVR specifically lowers the clock resolution.

    To wrap up, the fix mentioned in the original post is full of FUD.
     
  13. lucidus

    lucidus Ancient Guru

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    ^^ I guess that settles it then. Report this dumbas5 so that he can play on his WiiU 24x7.
     
  14. Penal Stingray

    Penal Stingray Banned

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    Latency Mon shows I got 7 Kernel I used to get 84 before it wonder why? did those tweak did something? lol

    [​IMG]
     
  15. WhiteLightning

    WhiteLightning Don Illuminati Staff Member

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    your supposed to let it running abit longer, not 3 secs
     

  16. -Tj-

    -Tj- Ancient Guru

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    ^
    HPET off in bios and in win8?

    I have both on and got 1000us with DPC latency checker.
     
  17. Penal Stingray

    Penal Stingray Banned

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    kinda odd my dpc latency timer says im hoovering around 12 and 14

    I have HPET on in bios and Platformlock true in windows which is enabled and im using the resolution tool timer which is set to 0.500 ms in simple

    HPET Bios+PlatformLock true HPET Windows Enabled+Resolution Timer Tool+Dynamictick disabled= low dpc and games , videos runs a lot better its like having a new pc. well that works for me it might not works on others since system is different. u gotta experiment which one is best suited for your system im just sharing the amazing results i found.
     
    Last edited: Jan 27, 2013
  18. Penal Stingray

    Penal Stingray Banned

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    well before the tweak it was the same time as soon as i open it, it was stuck at 84 to even 90 so it don't matter.
     
  19. Anarion

    Anarion Ancient Guru

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    All those latency tool show incorrect results in Windows 8 and they have not yet been updated. This is pretty pointless to be honest, it doesn't fix anything.

     
  20. Penal Stingray

    Penal Stingray Banned

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    then how do explain the drop on dpc when disabling dynamictick? it might not be accurate in reading but the drop in dpc is there. i mean its obvious going from 500 to 12 in dpc latency timer and going 84 to just 7 in latency mon when disabling dynamictick also why does game runs so damn smooth its gotta be doing something right? also disabling dynamictick solves some freezing issues found in windows 8.

    Windows 8 dynamic tick has a bug on it

    "An official workaround, courtesy of Microsoft Senior SDET hero Tripp Parks, is now available for those experiencing Windows 8 freezing issues. Simply open an elevated command prompt, issue the following command, and reboot:


    bcdedit /set disabledynamictick yes

    It’s still unclear what the exact issue is, but we can now surmise from this tweak that there’s definitely an issue with Windows and hardware compatibility — specifically dealing with the Windows clock and processor dynamic ticking.

    Okay, but what are dynamic ticks? Do I need them?

    Very generally speaking, (I’m not a hardware expert), your PC’s processor — like a clock — ticks at a certain rate. These ticks are received by the OS to perform various tasks and push paper around. When your PC is idle, however, this constant ticking and interrupting of the OS eats time and power.

    Cue dynamic ticking.

    This new concept involves the processor coalescing or batching together ticks when idle, only delivering them when a more interesting event occurs. In other words, the processor gets to hit the snooze button a few more times before waking up.

    (Hey, remember my previous memory dump showed processors in idle states? Interesting.)

    So wait, won’t turning this off eat more power/be less efficient?

    Very likely. But it appears the new dynamic ticking feature in Windows 8 has a bug in it. So turning it off should revert you back to behavior similar to what’s on Windows 7 until a fix comes out or a newer build becomes available."


    http://www.withinwindows.com/2012/06/28/workaround-for-windows-8-freezing-issues/

    in the end disabling it gets the dpc latency i usually get in windows 7 i unno if this can be fixed via updates or needs to be recoded again. maybe its one of the flaws that windows 8 have.
     
    Last edited: Jan 27, 2013

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