High DPC Latency Causes Audio Stutter

Crappey · May 7, 2014

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.

TomasD · May 8, 2014

Dear,

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

Download Windows Software Development Kit (SDK) for Windows and run the setup.
Select Windows Performance Toolkit feature (all the others can be unchecked) and proceed with the download/installation.
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.
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:
1. Run the following command which will stop the tracing:
  
  Code:
  
  xperf -stop
2. Run the following command to enable stack tracing (by disabling Paging Executive):
  
  Code:
  
  REG ADD "HKLM\System\CurrentControlSet\Control\Session Manager\Memory Management" -v DisablePagingExecutive -d 0x1 -t REG_DWORD -f
3. Reboot the computer
4. Once computer reboots, proceed from the step #3
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:
1. Run the following command to disable Driver Verifier, which causes the above error:
  
  Code:
  
  verifier /reset
2. Reboot the computer
3. Once computer reboots, proceed from the step #3
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:
Make sure you do not have any programs that captures ETW data already running. Some examples of these are:
- Process Explorer
- Process Hacker
- Resource Monitor
- Process Monitor
- Latency Monitor
- Another instance of XPERF or WPR
Perform some activities with your computer for few minutes, making sure the issues you reported are reproduced.
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
```
Compress file C:\CPU.etl
Upload the compressed file to a file sharing service (e.g. OneDrive or DropBox).
Share the download link here.

Thank you.

Crappey · May 8, 2014

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

TomasD · May 9, 2014

Crappey said:
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.

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High DPC Latency Causes Audio Stutter

Crappey

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TomasD

Sysnative Staff, BSOD Kernel Dump Senior Analyst

Crappey

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TomasD

Sysnative Staff, BSOD Kernel Dump Senior Analyst