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  1. #21
    Tekno Venus's Avatar
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    Re: How to Diagnose and Fix High DPC Latency Issues with WPA (Windows Vista/7/8)

    Hmm..

    Thanks for the file. I will look at that when I get a free moment. Although I'm not sure when that'll be, because I am busy with school work and revision atm.

    Regarding DPC Latency Checker, no, it is not Windows 8 compatible.



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  2. #22
    Tekno Venus's Avatar
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    Re: How to Diagnose and Fix High DPC Latency Issues with WPA (Windows Vista/7/8)

    For those experiencing issues with Windows 8.1 and this tutorial...

    Please install this version of the Windows ADK - Download Windows Assessment and Deployment Kit (Windows ADK) for Windows 8.1 from Official Microsoft Download Centre, instead of the one given in the tutorial.

    And perform the remaining steps in the tutorial again.


  3. #23
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    Re: How to Diagnose and Fix High DPC Latency Issues with WPA (Windows Vista/7/8)

    Quote Originally Posted by Tekno Venus View Post
    For those experiencing issues with Windows 8.1 and this tutorial...

    Please install this version of the Windows ADK - Download Windows Assessment and Deployment Kit (Windows ADK) for Windows 8.1 from Official Microsoft Download Centre, instead of the one given in the tutorial.

    And perform the remaining steps in the tutorial again.
    Thanks for that Stephen! Tutorial updated.
    Tekno Venus says thanks for this.

  4. #24
    Tekno Venus's Avatar
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    Re: How to Diagnose and Fix High DPC Latency Issues with WPA (Windows Vista/7/8)

    Quote Originally Posted by niemiro View Post
    Quote Originally Posted by Tekno Venus View Post
    For those experiencing issues with Windows 8.1 and this tutorial...

    Please install this version of the Windows ADK - Download Windows Assessment and Deployment Kit (Windows ADK) for Windows 8.1 from Official Microsoft Download Centre, instead of the one given in the tutorial.

    And perform the remaining steps in the tutorial again.
    Thanks for that Stephen! Tutorial updated.
    No problem.

    I am looking into more advanced XPerf and Windows Performace Toolkit techniques, especially with Windows 7 and newer, to get an even better look at these DPC issues. :)


  5. #25

    Re: How to Diagnose and Fix High DPC Latency Issues with WPA (Windows Vista/7/8)

    well i finally got around to installing the the newer assessment and deployment kit. But i get this error:
    C:\Users\Admin\Desktop>xperf %userprofile%\Desktop\trace.etl
    xperf: error: C:\Users\Admin\Desktop\trace.etl: The parameter is incorrect. (0x80070057).


    Microsoft (R) Windows (R) Performance Analyzer Version 6.3.9600
    Performance Analyzer Command Line
    Copyright (c) 2013 Microsoft Corporation. All rights reserved.


    Usage: xperf options ...


    xperf -help start for logger start options
    xperf -help providers for known tracing flags
    xperf -help stackwalk for stack walking options
    xperf -help stop for logger stop options
    xperf -help merge for merge multiple trace files
    xperf -help processing for trace processing options
    xperf -help symbols for symbol decoding configuration
    xperf -help query for query options
    xperf -help mark for mark and mark-flush
    xperf -help format for time and timespan formats on the command line
    xperf -help profiles for profile options

    then i tried this
    C:\Users\Admin\Desktop>xperf trace.etl

    and got the same error

  6. #26

    Re: How to Diagnose and Fix High DPC Latency Issues with WPA (Windows Vista/7/8)

    well, i found windows performance analyzer and opened the etl file. but there is no dpc latency cpu table. so i went to the 'computation' graph in the left hand column and double clicked to get a big view. in the top blue bar on the right edge are 4 icons one of which says 'display table only' when you hover over it. selecting this gives the table. now the highest count is held by a process named idle, then crss.exe followed by steam.exe then explorer.exe. if i look at the column titled 'ready(us) sum' the highest three are 'system, explorer, and steam'. The highest three for 'ready (us) max' are 'egui (part of nod32 antivirus), dtlite(part of daemon tools) , and vds.exe. right clicking on a column name gives many more parameters that i can examine but i do not know what they mean. So how do i interpret this data? Which parameter is most useful in figuring out if my latency is being damaged by a particular process?

  7. #27
    Tekno Venus's Avatar
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    Re: How to Diagnose and Fix High DPC Latency Issues with WPA (Windows Vista/7/8)

    Quote Originally Posted by bwana View Post
    well i finally got around to installing the the newer assessment and deployment kit. But i get this error:
    C:\Users\Admin\Desktop>xperf %userprofile%\Desktop\trace.etl
    xperf: error: C:\Users\Admin\Desktop\trace.etl: The parameter is incorrect. (0x80070057).


    Microsoft (R) Windows (R) Performance Analyzer Version 6.3.9600
    Performance Analyzer Command Line
    Copyright (c) 2013 Microsoft Corporation. All rights reserved.


    Usage: xperf options ...


    xperf -help start for logger start options
    xperf -help providers for known tracing flags
    xperf -help stackwalk for stack walking options
    xperf -help stop for logger stop options
    xperf -help merge for merge multiple trace files
    xperf -help processing for trace processing options
    xperf -help symbols for symbol decoding configuration
    xperf -help query for query options
    xperf -help mark for mark and mark-flush
    xperf -help format for time and timespan formats on the command line
    xperf -help profiles for profile options

    then i tried this
    C:\Users\Admin\Desktop>xperf trace.etl

    and got the same error
    Try

    xperfview %userprofile%\Desktop\trace.etl

    instead of

    xperf %userprofile%\Desktop\trace.etl


  8. #28

    Re: How to Diagnose and Fix High DPC Latency Issues with WPA (Windows Vista/7/8)

    C:\Users\aDMIN\Desktop>xperfview %userprofile%\Desktop\trace.etl


    'xperfview' is not recognized as an internal or external command,
    operable program or batch file.

    BUT WPA WORKS

    C:\Users\Admin\Desktop>WPA %userprofile%\Desktop\trace.etl


    for windows performance analyzer

    still need more insight into what to look for

  9. #29

    Re: How to Diagnose and Fix High DPC Latency Issues with WPA (Windows Vista/7/8)

    Quote Originally Posted by bwana View Post
    C:\Users\aDMIN\Desktop>xperfview %userprofile%\Desktop\trace.etl


    'xperfview' is not recognized as an internal or external command,
    operable program or batch file.

    BUT WPA WORKS

    C:\Users\Admin\Desktop>WPA %userprofile%\Desktop\trace.etl


    for windows performance analyzer

    still need more insight into what to look for

    I also need this answered please I am stuck on this as well, thanks!!

  10. #30
    Tekno Venus's Avatar
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    Re: How to Diagnose and Fix High DPC Latency Issues with WPA (Windows Vista/7/8)

    Naviagte to

    C:\Program Files (x86)\Windows Kits\8.0\Windows Performance Toolkit\

    or

    C:\Program Files (x86)\Windows Kits\8.1\Windows Performance Toolkit

    (not sure which one it will be)

    And see if there's a file called xperfview.exe

    Sorry I can't be more help atm, I don't use Windows 8 or 8.1 - I'm still running Windows 7 here!

    Stephen


  11. #31

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    Re: How to Diagnose and Fix High DPC Latency Issues with WPA (Windows Vista/7/8)

    Unfortunately, since 8.1 kit (6.3.9600) xperfview is not available any more But you can use the WPA, which covers most of the functionality available in xperfview :)

    m.g.
    Tekno Venus and jcgriff2 say thanks for this.

  12. #32

    Re: How to Diagnose and Fix High DPC Latency Issues with WPA (Windows Vista/7/8)

    Make sure you start cmd.exe (command prompt) using "Run As Administrator". I had the same issue with running xperf.

  13. #33

    Re: How to Diagnose and Fix High DPC Latency Issues with WPA (Windows Vista/7/8)

    I get error when I run xperf% userprofile% \ Desktop \ trace.etl
    please help me i have windows 8.1

  14. #34

    Re: How to Diagnose and Fix High DPC Latency Issues with WPA (Windows Vista/7/8)

    Hi,

    i followed Niemiros tutorial and the process that seems to cause the problem seems to be "ntoskrnl.exe" i'm runnig on a Gigabyte p35-de3r mainboard with a gforce 8800gtx and win7 home prem. I had no problems of this type with my previous installation. I ran Latencymon everytime after installing win7 clean, with chipset drivers, with nvidia driver and after doing the 100 updates. From the very beginning till now Latency mon and DPC Latency are showing that "ntoskrnl" is having a high latency and couses the sound to pop. I adjusted one systemstart in savemode via "Msconfig" and the problem was gone. So i know none of my hardware is broken. I really need to solve this one to get to work again.

    How to Diagnose and Fix High DPC Latency Issues with WPA (Windows Vista/7/8)-latencymon-save-jpg save mode
    How to Diagnose and Fix High DPC Latency Issues with WPA (Windows Vista/7/8)-latency-jpg common

  15. #35

    Re: How to Diagnose and Fix High DPC Latency Issues with WPA (Windows Vista/7/8)

    How to Diagnose and Fix High DPC Latency Issues with WPA (Windows Vista/7/8)-dpc-cpu-jpg

  16. #36

    Re: How to Diagnose and Fix High DPC Latency Issues with WPA (Windows Vista/7/8)

    Hey.
    I had problems with sounds and mouse stuttering for a long time now, yesterday i finally learnt about the dpc latency thing. I managed to find the driver responsible for this.
    It's called "wdf01000.sys" (http://screenshu.com/static/uploads/.../4a/i0ryo6.jpg)
    I searched for information about it, and all i found is that it's responsible for "Kernel Mode Driver Framework Runtime" and that it can be updated with windows update
    Sadly, there are no updates for it available, and i can't disable it.
    Anyone, please help.
    I'm on windows 8.1, 8gb ram, i5 4670k CPU.

  17. #37

    Re: How to Diagnose and Fix High DPC Latency Issues with WPA (Windows Vista/7/8)

    Thanks a lot for the 1st post. I managed to clean my creative soundblaster drivers, its ctoss2k.sys was giving me a lot of latency. The effect this latency is having on my computer is that if I leave my pc idle, after exactly two minutes, my screen starts to get a low FPS (8-10 frames per second) and in my Windows 7 OS itself, no matter what software I'm running or not. The moment I move my mouse or press a key the low FPS dissapear and everything returns to normal.
    Sadly NVidia drivers are giving me high latency as well even wih the last version of their drivers 337.88
    And the most intriguing driver with a high latency is one that XPerf is not able to identify marked with a ? as show below. Does anyone know what program I could use to identify what stealth driver this is and how to delete it?
    How to Diagnose and Fix High DPC Latency Issues with WPA (Windows Vista/7/8)-final-png

  18. #38

    Re: How to Diagnose and Fix High DPC Latency Issues with WPA (Windows Vista/7/8)

    Thanks for posting this in depth guide, but sadly I could not fix my issue. I have a thread open currently about it

  19. #39

    Re: How to Diagnose and Fix High DPC Latency Issues with WPA (Windows Vista/7/8)

    Sorry this maybe a stupid question but what and where do I click on "start orb" Do I even have the right program downloaded How to Diagnose and Fix High DPC Latency Issues with WPA (Windows Vista/7/8)-wpa-jpg

  20. #40

    Re: How to Diagnose and Fix High DPC Latency Issues with WPA (Windows Vista/7/8)

    OOOOOOOOOOOOkaaaaaaaaayyyyyyyyy. . . everything went super peachy up until the part I was supposed to note down the driver causing the issue. Turns out the name of the driver is "?" and it's function, likewise, is "?" Any idea what I should do with this?

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