DPC spike at Windows automatic maintenance startup. Can not leave the computer alone processing real-time streams.
This is what happens when I leave the computer idle for a while and the Windows automatic maintenance starts:
Driver file Description ISR count DPC count Highest execution (ms) Total execution (ms)
ntoskrnl.exe NT Kernel & System 0 50764 0,235854
332,950426
A DPC spike is generated by ntoskrnl.exe causing drop outs in real-time streams.
JTS
Hi Fjtorsol,
We hope your issue has been resolved, if you've found solution by yourself. you could share with us and we will mark it as answer.
This high Deferred Procedure Call (DPC) latencies are usually caused by certain drivers, if it is caused by automatic maintenance, please re-check your task schedule which is marked as “when computer is idle”. As what has been suggested by MVP ZigZag, please
use the Microsoft Windows Performance Analyzer from the Windows Assessment and Deployment Kit (ADK) to identify the cause of any DPC latency spikes.
https://www.microsoft.com/en-gb/download/details.aspx?id=39982
DPC CPU Usage Summary Table will open containing a list of drivers/program. This list is already correctly sorted (by the Actual Duration column). The process on the very top of the list is therefore likely to be the cause of your problem.
Regards
D. Wu
Please remember to mark the replies as answers if they help, and unmark the answers if they provide no help. If you have feedback for TechNet Support, contact [email protected]
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