High DPC Latency and frequent Interrupts


  1. Dreck
    Posts : 26
    win 7
       New #1

    High DPC Latency and frequent Interrupts


    I am getting frequent interrupts which freezes the whole system for a second. I am attaching some screenshots from Latency Monitor which might be useful.



    I have also made a xperf trace too using this command:

    Code:
    xperf -on PROC_THREAD+LOADER+PROFILE+INTERRUPT+DPC+DRIVERS+POWER -stackwalk Profile -BufferSize 1024 -MinBuffers 256 -MaxBuffers 256 -MaxFile 256 -FileMode Circular
    Here is the link to the trace file Dropbox - CPU.zip

    Can someone have a look at this trace file and suggest what could be the problem?
    I would be glad to provide any additional info if needed..

    Thanks
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  3. Dreck
    Posts : 26
    win 7
    Thread Starter
       New #2

    Can anyone help me with this?
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  4. fireberd
    Posts : 8,135
    Windows 10 64 bit
       New #3

    Your PC specs are needed. Will help someone to try and help you.

    This looks like an old PC??? The i8042prt.sys, according to what I find, is a driver for an old PS/2 port.
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  6. Dreck
    Posts : 26
    win 7
    Thread Starter
       New #4

    Thanks for your reply

    http://speccy.piriform.com/results/B...n6gzQnHXeD48M2

    Here is my system spec from speccy. Please let me know if you need anything else.
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  7. fireberd
    Posts : 8,135
    Windows 10 64 bit
       New #5

    What is the Dell Model? e.g. Inspiron 950, etc.

    I didn't see it directly in the Latency Mon list, but I saw "Google Updater" listed in the system specs software. I use my desktop for my recording studio PC and I had installed Google Chrome. After that I started to get clicks and dropouts in recording. I ran Latency Mon and it showed I had problems. The last thing dod was install Chrome so I uninstalled Chrome, but that did not uninstall the google updater. I uninstalled the updater but it didn't really uninstall. I finally had to manually edit the registry to remove all traces of it. As soon as I did that, Latency Mon was "happy" and my recording clicks and dropouts went away. May not be your problem but something to consider, especially since WLAN and network are mentioned.
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  8. fireberd
    Posts : 8,135
    Windows 10 64 bit
       New #6

    I'll be gone for a while so I can't immediately answer.
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  10. Dreck
    Posts : 26
    win 7
    Thread Starter
       New #7

    Its Dell Inspiron 5521. I will try uninstalling google updater too. Will let you know how it goes.
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  11. fireberd
    Posts : 8,135
    Windows 10 64 bit
       New #8

    Ah, a Laptop. Don't forget to reboot the PC before checking DPC Latency after uninstalling the Google Updater.
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  12. Dreck
    Posts : 26
    win 7
    Thread Starter
       New #9

    Uninstalling google chrome didnt make any difference. Removed registry and restarted. Still getting interrupts and latency monitor graph is off the charts
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  13. fireberd
    Posts : 8,135
    Windows 10 64 bit
       New #10

    Wi-Fi is another potential. Temporarily disable Wi-Fi and see if anything changes.
    I don't get much more from what you've posted.
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