DPC latency from Storport.sys

[thebobzer]

Hi,

Since the installation of windows 10 I'm having massive lag spikes. The lag will mess up video and audio.

These are screenshots of LatencyMon:


This is the ETL file https://www.dropbox.com/s/0zb0xo4npyrnbrh/CPU.rar?dl=0

I hope someone can help me fix this.

 

[xilolee]

Hi thebobzer. :welcome:
Where did you get that cpu.etl?
I can't see much in it...

Download and install the Windows Performance Toolkit on dev.windows.com - Windows Software Development Kit (SDK) for Windows 10 - sdksetup.exe 1.12MB (click):

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Click Download the standalone SDK (sdksetup.exe), save/run it and you'll see for first Specify location: leave it default or choose your preferred location, then click Next.

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Then you'll see Windows kits privacy: Niemiro said "you may opt in to CEIP if you so wish - it is not necessary, but you may wish to do so". Then click Next.

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Then you'll see License agreement: click Accept.

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Then you'll see Select the features you want to install: select only Windows Performance Toolkit and click Install.

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Then open an elevated command prompt (right-click on the windows start button on bottom-left corner, left-click Command Prompt (Admin)) and launch these commands:

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1. set the path environment variable adding the windows performance toolkit path:

   SET PATH=%PATH%;C:\Program Files (x86)\Windows Kits\10\Windows Performance Toolkit\

   If you have chosen another path in specify location, you should provide THAT ONE.
2. You can generate a new trace with these codes:
   Niemiro style

   xperf -on DiagEasy

   TomasD style

   xperf -on PROC_THREAD+LOADER+PROFILE+INTERRUPT+DPC -stackwalk Profile -BufferSize 1024 -MinBuffers 256 -MaxBuffers 256 -MaxFile 256 -FileMode Circular

3. wait some time (Niemiro said:" Wait until the computer has gone through a period of stuttering slowness) and then:

   xperf -d "%userprofile%\Desktop\trace.etl"

4. if you are using TomasD style, the command will generate also a kernel.etl in c:; move it to the desktop:

   move c:\kernel.etl "%userprofile%\Desktop\"

5. upload/post the files.
   You can attach them here through GoogleDrive, OneDrive, DropBox or similar services, or through websites for uploading files (like as an example speedyshare.com).

You can also read the original tutorial/guide and its following posts for more informations:
How to Diagnose and Fix High DPC Latency Issues with WPA (Windows Vista/7/8) (click) (by Niemiro)

 

[thebobzer]

Hello xilolee,

Thank you for your time and your in-depth response. I got that CPU.etl by following the steps reproduced in this thread:

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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:
   

   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):
   
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   1. Run the following command which will stop the tracing:
      

      xperf -stop

   2. Run the following command to enable stack tracing (by disabling Paging Executive):
      

      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):
   
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   1. Run the following command to disable Driver Verifier, which causes the above error:
      

      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):
   
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   Make sure you do not have any programs that capture 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
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:
   

   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.

When i try to generate a new CPU.etl file I get stuck on number 2. I get the following message:
*edit* the translation: can't make a file that's already existing.

Thanks again for looking into my case

 

[xilolee]

The SDK you see in TomasD's post is for windows 8/8.1.
My suggestion is to uninstall it and install the new one of Win10.
This is not mandatory, but if you are using Win10, why should you install old tools (when there are new ones)?

By the way, about that error you are getting, could it be you didn't stop the tracing (maybe that could explain for/why the trace was incomplete)?

 

[thebobzer]

Hi,

When I installed the tool, I didn't install the tool for windows 8/8.1, but the one for windows 10.

I think the trace did stop. I just followed all the commands and it produced the file..

 

[xilolee]

Good!
I see you have got a more updated version than mine, maybe it is me that should change the version!
It seems you installed everything; it would have sufficed to install only the Windows Performance Toolkit.
However, re-try to generate a new trace.

 

[thebobzer]

Hi,

I generated a new trace. https://www.dropbox.com/s/aj12dmt1nyyrg0l/Desktop.rar?dl=0
I hope this one works

 

[xilolee]

Let's try updating the audio driver (if you haven't already updated it).
Go to device manager, sound, video and game controllers, right-click on your sound card(s), click update driver software, click search automatically for updated driver software.
If it won't find it, check for audio driver of your PC model on the manufacturer website.
If you can't find it, and you are using Xonar Essence STX (like it seems from the trace), check:

ASUS Xonar Essence STX driver for Windows 10 x64 Version 8.1.8.1823

https://www.asus.com/Essence-Hi-Fi-Audio/Xonar_Essence_STX/HelpDesk_Download

I've also seen a bunch of conhost.exe and bztrans64_thread01.exe <---> bztrans64_thread09.exe.
That is something I didn't like to see, but it could be normal if you are using Backblaze Unlimited Backup (?).

 

[thebobzer]

Hi,

Thank you so much for your advice. I installed the latest update for my ASUS sound card when I installed windows 10 about a week ago. I tried reinstalling it, but that didn't seem to help.
I am using Backblaze Unlimited Backup to backup my files. I hope that program isn't an issue.

 

[thebobzer]

Can someone help me with this problem?

 

[xilolee]

USB.dll is another module in the first hits.
What USB devices are you using?

Additional informations could be useful; for example:

• System information log (run it from an elevated command prompt):
  

  msinfo32 /nfo %desktop%\MsInfo.nfo

• Retrieve System Information, using speccy
  1. Download Speccy portable - actual version 1.29.714 (click), unzip/decompress it and put it on your desktop.
  2. When the program opens, it will retrieve some information regarding your system.
  3. Once it's done, select the File menu and choose Publish snapshot. Answer Yes to the confirmation message.
  4. On the next screen that comes up, choose the Copy to Clipboard button and paste this link in your next reply.

 

[xilolee]

Sorry, the command for System information is:

msinfo32 /nfo %userprofile%\desktop\MsInfo.nfo

(I created the %desktop% variable to speed up the typing on the keyboard ).