1. #1

    Exclamation High DPC Latency Causes Audio Stutter

    Been experiencing this problem for quite a while and it usually starts after a couple of days without turning off my computer. Restarting my computer is a temporary fix but even then it may not always work. LatencyMon and trace shows that usbport.sys is the blame but all my drivers are up to date. Attached are a screenshot of Speccy and LatencyMon. Would love any advice and help as this problem has been around for a long time and it's extremely annoying.
    Attached Thumbnails Attached Thumbnails High DPC Latency Causes Audio Stutter-h5jcbk6-png   High DPC Latency Causes Audio Stutter-pmkpwfw-png  


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  2. #2
    TomasD's Avatar
    Join Date
    May 2013
    Location
    Kaunas, Lithuania
    Posts
    461
    • specs System Specs
      • Manufacturer:
        Lenovo
      • Model Number:
        X230T
      • Motherboard:
        Lenovo ThinkPad X230 Tablet
      • CPU:
        Intel Core i5-3320M
      • Memory:
        Corsair Vengeance 2x8GB DDR3-1600 (800 MHz)
      • Graphics:
        Intel HD Graphics 4000
      • Sound Card:
        Realtek ALC269
      • Disk Drives:
        SAMSUNG SSD 830 Series (238 GB)
      • Display:
        BenQ BL2400
      • Operating System:
        Microsoft Windows 8.1

    Re: High DPC Latency Causes Audio Stutter

    Dear,

    To properly troubleshoot issues with high/frequent DPCs/IRPs, we require a XPERF trace. Please follow these steps to generate one:

    1. Download Windows Software Development Kit (SDK) for Windows and run the setup.
    2. Select Windows Performance Toolkit feature (all the others can be unchecked) and proceed with the download/installation.
    3. Once the installation finishes, open an elevated Command Prompt by right-clicking on CMD.EXE shortcut in your start menu and selecting Run As Administrator from the context menu.
    4. Type the following command, which will start tracing, in the Command Prompt window you just opened:
      Code:
      xperf -on PROC_THREAD+LOADER+PROFILE+INTERRUPT+DPC+DRIVERS+POWER+IDLE_STATES -stackwalk Profile -BufferSize 1024 -MinBuffers 256 -MaxBuffers 256 -MaxFile 256 -FileMode Circular
      If you see a yellow warning "xperf: warning: This system is not fully configured for x64 stack tracing" after running the above command, please complete these extra steps (otherwise, proceed to the step #5):
      Read More:

      If you see a red error "xperf: error: NT Kernel Logger: A device attached to the system is not functioning. (0x1f)" after running the above command, please complete these extra steps (otherwise, proceed to the step #5):
      Read More:

      If you see a red error "xperf: error: NT Kernel Logger: Cannot create a file when that file already exists. (0xb7)", please do the following (otherwise, proceed to the step #5):
      Read More:
    5. Perform some activities with your computer for few minutes, making sure the issues you reported are reproduced.
    6. Run the following command, which will stop the tracing, in the command prompt window you already have opened:
      Code:
      xperf -stop -d C:\CPU.etl
    7. Compress file C:\CPU.etl
    8. Upload the compressed file to a file sharing service (e.g. OneDrive or DropBox).
    9. Share the download link here.

    Thank you.
    Trips says thanks for this.
    http://www.dabasinskas.net (MCP | MCTS | MCITP | MCSA | MCSE | MVP | MS | ITV3F | ZCE | VCA)


  3. #3

    Re: High DPC Latency Causes Audio Stutter

    Here is the trace http://1drv.ms/1isYMHD

  4. #4
    TomasD's Avatar
    Join Date
    May 2013
    Location
    Kaunas, Lithuania
    Posts
    461
    • specs System Specs
      • Manufacturer:
        Lenovo
      • Model Number:
        X230T
      • Motherboard:
        Lenovo ThinkPad X230 Tablet
      • CPU:
        Intel Core i5-3320M
      • Memory:
        Corsair Vengeance 2x8GB DDR3-1600 (800 MHz)
      • Graphics:
        Intel HD Graphics 4000
      • Sound Card:
        Realtek ALC269
      • Disk Drives:
        SAMSUNG SSD 830 Series (238 GB)
      • Display:
        BenQ BL2400
      • Operating System:
        Microsoft Windows 8.1

    Re: High DPC Latency Causes Audio Stutter

    Quote Originally Posted by Crappey View Post
    Here is the trace http://1drv.ms/1isYMHD
    Sorry, but this trace doesn't seem to be generated using the command I provided. Please use the latest WPA version and the command I provided above.

    Thank you.
    http://www.dabasinskas.net (MCP | MCTS | MCITP | MCSA | MCSE | MVP | MS | ITV3F | ZCE | VCA)


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