September 28, 20196 yr Hi Guys, Been working to resolve some usb sound issues even though im using controller passthrough. Came across this link from mbk1969 on 'The guru of 3D' - https://forums.guru3d.com/threads/simple-way-to-trace-dpcs-and-isrs.423884/ that provides more detail then Latencymon. Quote Everyone uses Latencymon nowadays to troubleshoot DPC latencies. I stumbled across even simpler way provided by Microsoft. 1. Install "Windows Performance Toolkit" from Windows ADK (for your version of Windows) https://docs.microsoft.com/en-us/windows-hardware/get-started/adk-install For my Win10 1803 it costs 2. Launch elevated command prompt and execute to start the trace: Code: cd "C:\Program Files (x86)\Windows Kits\10\Windows Performance Toolkit" xperf -on base+interrupt+dpc 3. Run the game, the video, or whatever you are trying to troubleshoot. 4. Return to command prompt to stop the trace and to save the trace file: Code: xperf -d c:\temp\trace.etl Choose your own path and name for that trace file. 5. Generate the text report file for DPCs and ISRs: Code: xperf -i c:\temp\trace.etl -o c:\temp\report.txt -a dpcisr 6. Now you can open that text report file to browse quite detailed info. -where "us", "usec" and "usecs" stand for "microseconds". -You can see how many DPCs/ISRs for each module fall to ranges - between 0 and 1 microseconds, between 1 and 2 microseconds, and so forth. -Also you can see summaries for DPCs and ISRs per CPU. Feel free to go thank him direct. Just posting here in case the other post goes a missing.
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