System Interrupts Huge CPU Usage

Anonymous
2009-11-18T12:06:50+00:00

Hi,

I have just recently installed Windows 7 Professional on my machine and I am having a problem with a process called System Interrupts using alot (25% approximately) of CPU.

I have tried several supposed fixes i have found here and on other forums but have not solved the issue.

I am at wits end.

http://i289.photobucket.com/albums/ll203/SK-illfull/systeminterrupts.jpg

Mobo: Gigabyte GA-EP35-DS3

Video Card: Nvidea 8800 GTX

Windows for home | Previous Windows versions | Windows update

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Anonymous
2012-02-23T09:40:40+00:00

My computer got so slow that the mouse was slow and jerky and I had to reboot. System interrupts was at about 30% CPU time. My PC is now with 5 days uptime and the bug seems to have disappeared. The following solution seems to solve the issue :

  1. Right-click on the speaker icon
  2. Select playback devices
  3. Click on the speaker properties
  4. Go to the enhancements Tab
  5. Click Disable All Sound Effects
  6. Click OK. You're done!

The sound enhancements seem for some reason to cause the problem even when not used. So disable them following the procedure above. Good luck!

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  1. Anonymous
    2010-01-19T09:02:47+00:00

    Attempted to install Nvidia nForce drivers instead of eVGA's mobo drivers.

    Seemed to help a little, but still have the same problem.

    And instead of nvstor.sys, now its nvstor64.sys  (For my 64bit Win7)

    Sigh...

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  2. Anonymous
    2010-01-19T08:30:49+00:00

    I've had this problem for a few days now since installing Windows 7 on a clean format.  I'm pretty much out of ideas at this point.

    2.67ghz Intel Core 2 Duo

    EVGA 122-CK-NF68 mobo

    ATI Radeon 4800 card

    No amount of driver installations have fixed it (Bios, mobo, video)

    I followed your guide Andre on detecting the culprit behind the DPC interrupt, here are my results:

    http://usera.imagecave.com/Suigintou/dpcresult.png.jpg

    I know nvstor.sys is the nForce SATA driver, but I don't know how to approach fixing this.  When I first booted into Windows 7 I already had this issue before I even installed motherboard drivers.

    Any help would be greatly appreciated!

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  3. Anonymous
    2010-01-16T16:48:42+00:00

    Hi Markus,

    yes, you can save the 3 MSI files and copy them to a save location (USB flash device, external HDD) and remove the Win7 SDK again. I don't know why MS removed the single installers.

    Have a nice weekend without the high CPU usage.

    André

    "A programmer is just a tool which converts caffeine into code" CLIP- Stellvertreter http://www.winvistaside.de/

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  4. Anonymous
    2010-01-16T16:06:26+00:00

    Andre,

    fantastic. It worked. I found that a SATA device had an erroneous PCI driver attached to it (!!) and caused one core to run at a constant 60% load. Updating the driver fixed it instantly.  Highly recommended method to all posters. Only drawback was the 3 h download of 2.5 GB, only a small part of which is used (the wpt_x64.msi file in my cse), and I had one aborted download due to server rror, and even the SDK installation reported fatal error. Nonetheless after wpt_x64.msi install, all worked as advertised. BTW can I remove the rest of the SDK toolkit and just reinstall wpt_x64.msi for future reference? (saves a lot of disk space). In any case Andre many thanks! - Markus

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