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. My example for DPCs: Spoiler Code: -------------------------- DPC Info -------------------------- CPU Usage Summing By Module For the Whole Trace CPU Usage from 0 us to 45524244 us: CPU 0 Usage, CPU 1 Usage, CPU 2 Usage, CPU 3 Usage, CPU 4 Usage, CPU 5 Usage, CPU 6 Usage, CPU 7 Usage, CPU 8 Usage, CPU 9 Usage, CPU 10 Usage, CPU 11 Usage, usec %, usec %, usec %, usec %, usec %, usec %, usec %, usec %, usec %, usec %, usec %, usec %, Module 0 0.00, 0 0.00, 27 0.00, 0 0.00, 0 0.00, 0 0.00, 0 0.00, 0 0.00, 0 0.00, 0 0.00, 0 0.00, 0 0.00, CLASSPNP.SYS 3180 0.01, 0 0.00, 0 0.00, 0 0.00, 0 0.00, 0 0.00, 0 0.00, 0 0.00, 0 0.00, 0 0.00, 0 0.00, 0 0.00, HDAudBus.sys 45 0.00, 0 0.00, 1 0.00, 2 0.00, 31 0.00, 0 0.00, 9 0.00, 2 0.00, 0 0.00, 0 0.00, 0 0.00, 0 0.00, Ndu.sys 5 0.00, 0 0.00, 5 0.00, 0 0.00, 23 0.00, 0 0.00, 7 0.00, 0 0.00, 8 0.00, 0 0.00, 0 0.00, 0 0.00, Ntfs.sys 211 0.00, 0 0.00, 23 0.00, 7 0.00, 36 0.00, 0 0.00, 13 0.00, 7 0.00, 0 0.00, 15 0.00, 7 0.00, 8 0.00, USBPORT.SYS 14 0.00, 0 0.00, 0 0.00, 0 0.00, 0 0.00, 0 0.00, 0 0.00, 0 0.00, 0 0.00, 0 0.00, 0 0.00, 0 0.00, WdFilter.sys 2852 0.01, 0 0.00, 0 0.00, 0 0.00, 0 0.00, 0 0.00, 0 0.00, 0 0.00, 0 0.00, 0 0.00, 0 0.00, 0 0.00, asmtxhci.sys 27992 0.06, 0 0.00, 108 0.00, 8 0.00, 208 0.00, 0 0.00, 55 0.00, 14 0.00, 8 0.00, 8 0.00, 34 0.00, 9 0.00, dxgkrnl.sys 247 0.00, 0 0.00, 41 0.00, 0 0.00, 97 0.00, 5 0.00, 32 0.00, 11 0.00, 18 0.00, 3 0.00, 36 0.00, 5 0.00, dxgmms2.sys 1 0.00, 0 0.00, 5 0.00, 0 0.00, 0 0.00, 0 0.00, 0 0.00, 0 0.00, 0 0.00, 0 0.00, 0 0.00, 0 0.00, hal.dll 14 0.00, 0 0.00, 0 0.00, 0 0.00, 0 0.00, 0 0.00, 0 0.00, 0 0.00, 0 0.00, 0 0.00, 0 0.00, 0 0.00, kbdhid.sys 681 0.00, 0 0.00, 43 0.00, 22 0.00, 101 0.00, 0 0.00, 16 0.00, 0 0.00, 19 0.00, 23 0.00, 12 0.00, 13 0.00, ndis.sys 32259 0.07, 510 0.00, 4375 0.01, 1879 0.00, 10845 0.02, 1776 0.00, 4951 0.01, 2481 0.01, 2466 0.01, 2638 0.01, 7674 0.02, 3018 0.01, ntoskrnl.exe 167796 0.37, 0 0.00, 147 0.00, 60 0.00, 459 0.00, 7 0.00, 93 0.00, 36 0.00, 7 0.00, 32 0.00, 85 0.00, 4 0.00, nvlddmkm.sys 0 0.00, 0 0.00, 0 0.00, 0 0.00, 6 0.00, 0 0.00, 0 0.00, 0 0.00, 0 0.00, 0 0.00, 0 0.00, 0 0.00, rdyboost.sys 82 0.00, 0 0.00, 0 0.00, 0 0.00, 0 0.00, 0 0.00, 0 0.00, 0 0.00, 0 0.00, 0 0.00, 0 0.00, 0 0.00, storahci.sys 939 0.00, 21 0.00, 649 0.00, 82 0.00, 896 0.00, 0 0.00, 1113 0.00, 9 0.00, 428 0.00, 929 0.00, 842 0.00, 22 0.00, storport.sys 64 0.00, 15 0.00, 302 0.00, 128 0.00, 145 0.00, 0 0.00, 324 0.00, 4 0.00, 0 0.00, 106 0.00, 0 0.00, 298 0.00, tcpip.sys Total = 17090 Elapsed Time, > 0 usecs AND <= 1 usecs, 977, or 5.72% Elapsed Time, > 1 usecs AND <= 2 usecs, 1067, or 6.24% Elapsed Time, > 2 usecs AND <= 4 usecs, 3668, or 21.46% Elapsed Time, > 4 usecs AND <= 8 usecs, 4017, or 23.50% Elapsed Time, > 8 usecs AND <= 16 usecs, 1486, or 8.70% Elapsed Time, > 16 usecs AND <= 32 usecs, 1711, or 10.01% Elapsed Time, > 32 usecs AND <= 64 usecs, 3634, or 21.26% Elapsed Time, > 64 usecs AND <= 128 usecs, 457, or 2.67% Elapsed Time, > 128 usecs AND <= 256 usecs, 73, or 0.43% Total, 17090 Total = 5453 for module ntoskrnl.exe Elapsed Time, > 0 usecs AND <= 1 usecs, 108, or 1.98% Elapsed Time, > 1 usecs AND <= 2 usecs, 313, or 5.74% Elapsed Time, > 2 usecs AND <= 4 usecs, 1537, or 28.19% Elapsed Time, > 4 usecs AND <= 8 usecs, 1277, or 23.42% Elapsed Time, > 8 usecs AND <= 16 usecs, 431, or 7.90% Elapsed Time, > 16 usecs AND <= 32 usecs, 834, or 15.29% Elapsed Time, > 32 usecs AND <= 64 usecs, 946, or 17.35% Elapsed Time, > 64 usecs AND <= 128 usecs, 5, or 0.09% Elapsed Time, > 128 usecs AND <= 256 usecs, 2, or 0.04% Total, 5453 ... and for ISRs Spoiler Code: -------------------------- Interrupt Info -------------------------- CPU Usage Summing By Module For the Whole Trace CPU Usage from 0 us to 45524244 us: CPU 0 Usage, CPU 1 Usage, CPU 2 Usage, CPU 3 Usage, CPU 4 Usage, CPU 5 Usage, CPU 6 Usage, CPU 7 Usage, CPU 8 Usage, CPU 9 Usage, CPU 10 Usage, CPU 11 Usage, usec %, usec %, usec %, usec %, usec %, usec %, usec %, usec %, usec %, usec %, usec %, usec %, Module 4328 0.01, 0 0.00, 0 0.00, 0 0.00, 0 0.00, 0 0.00, 0 0.00, 0 0.00, 0 0.00, 0 0.00, 0 0.00, 0 0.00, HDAudBus.sys 1747 0.00, 0 0.00, 0 0.00, 0 0.00, 0 0.00, 0 0.00, 0 0.00, 0 0.00, 0 0.00, 0 0.00, 0 0.00, 0 0.00, asmtxhci.sys 235333 0.52, 0 0.00, 0 0.00, 0 0.00, 0 0.00, 0 0.00, 0 0.00, 0 0.00, 0 0.00, 0 0.00, 0 0.00, 0 0.00, dxgkrnl.sys 767 0.00, 0 0.00, 0 0.00, 0 0.00, 0 0.00, 0 0.00, 0 0.00, 0 0.00, 0 0.00, 0 0.00, 0 0.00, 0 0.00, ndis.sys 2903 0.01, 0 0.00, 0 0.00, 0 0.00, 0 0.00, 0 0.00, 0 0.00, 0 0.00, 0 0.00, 0 0.00, 0 0.00, 0 0.00, storport.sys Total = 6733 Elapsed Time, > 0 usecs AND <= 1 usecs, 248, or 3.68% Elapsed Time, > 1 usecs AND <= 2 usecs, 277, or 4.11% Elapsed Time, > 2 usecs AND <= 4 usecs, 470, or 6.98% Elapsed Time, > 4 usecs AND <= 8 usecs, 907, or 13.47% Elapsed Time, > 8 usecs AND <= 16 usecs, 513, or 7.62% Elapsed Time, > 16 usecs AND <= 32 usecs, 965, or 14.33% Elapsed Time, > 32 usecs AND <= 64 usecs, 1272, or 18.89% Elapsed Time, > 64 usecs AND <= 128 usecs, 2080, or 30.89% Elapsed Time, > 128 usecs AND <= 256 usecs, 1, or 0.01% Total, 6733 Total = 728 for module HDAudBus.sys Elapsed Time, > 0 usecs AND <= 1 usecs, 0, or 0.00% Elapsed Time, > 1 usecs AND <= 2 usecs, 0, or 0.00% Elapsed Time, > 2 usecs AND <= 4 usecs, 0, or 0.00% Elapsed Time, > 4 usecs AND <= 8 usecs, 670, or 92.03% Elapsed Time, > 8 usecs AND <= 16 usecs, 53, or 7.28% Elapsed Time, > 16 usecs AND <= 32 usecs, 4, or 0.55% Elapsed Time, > 32 usecs AND <= 64 usecs, 0, or 0.00% Elapsed Time, > 64 usecs AND <= 128 usecs, 1, or 0.14% Total, 728 ... 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.
And "Windows Performance Toolkit" comes with GUI tools "Windows Performance Recorder" and "Windows Performance Analyzer" as well. I started to prepare screenshots with these tools but decided to write only about "xperf" usage as a simplest one. But you can open etl-files in "Windows Performance Analyzer" and view raw ETW info in sophisticated and complicated way to feel as very smart person.
>3. Run the game, the video, or whatever you are trying to troubleshoot. none of the vendors will accept DPC/ISR bug reports when the device is busy.
Who cares what vendors do? It is just a way to find possible culprit, troubleshoot, and change the vendor if troubleshooting was not successful.
I've heard of this but majority use latencymon... I should try this whenever I have enough time and my craptastic internet becomes more stable again. ATT sucking it with DNS probe problems... this I believe is across the U.S
