Windows 8 and 8.1 Forums


Why is the DPC latency high on Windows 8?

  1. #1

    Why is the DPC latency high on Windows 8?


    I cannot recall what it was in Windows 7 exactly, but it was much less than 500us. In Windows 8, it never drops below 1000us.

    I measured the DPC Latency using the DPC Latency Checker.

    Any idea why this is? Immature drivers? (Specs in the sig btw)

    Click image for larger version

    This is also on the *leaked* Windows 8 x64 Enterprise. (Don't worry, I have MSDN and am getting the real thing on 15th )

      My System SpecsSystem Spec

  2. #2


    Posts : 454
    Windows 8.1 Pro with Media Center


    LatencyMon should tell you which driver is responsible.
      My System SpecsSystem Spec

  3. #3


    Quote Originally Posted by crawfish View Post
    LatencyMon should tell you which driver is responsible.
    here are the results.

    Click image for larger version

    so nVidia driver is the culprit?
      My System SpecsSystem Spec

  4. #4


    Posts : 454
    Windows 8.1 Pro with Media Center


    Quote Originally Posted by Anusha View Post
    so nVidia driver is the culprit?
    Looks that way. Google /"windows 8" dpc latency nvidia 304.79/ and you'll find others talking about it.
      My System SpecsSystem Spec

  5. #5


    Posts : 17
    Windows 8 CP


    taken from DPC Latency Checker

    "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"

    IE don't worry about it. In fact from something I read Cakewalk (who make a DAW called Sonar) claimed improvements in core scheduling, latency, availability etc.

    The Cakewalk Blog Blog Archive Windows 8 – A benchmark for music production applications

    CDJay
      My System SpecsSystem Spec

  6. #6


    Thanks.
      My System SpecsSystem Spec

Why is the DPC latency high on Windows 8?
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