A few times a day my CPU will jump to 99% usage, and it will stay there until I force a shutdown (via unplugging it). Below is a snap of the task manager during this time. I am certain a virus is not the problem. update I have found I can reproduce the problem by putting my network card under load. I have tried 3 different wireless cards (usb adapter), and it happens will every one of them.
What is installed?
- Firefox 3.5
- Chrome Beta version
- MS Security Essentials
- Win 7 Ultimate (64bit)
I would assume there is a faulty driver, but I have no idea where to start. Does anybody know what the best thing to do is in this situation?
updated the screen shot to show process explorer while the problem is occurring. Does that help? Look at the Hardware Interrupt/DPC usage. What would cause that to be so high?
And this pic is the same thing while the system is fine
Answer
a similar problem (high CPU usage caused by Deferred Procedure Calls) is being discussed here:
I am running Windows 7 Ultimate and my
specs are AMD Phenom 9550 Quad-Core
Processor 2.20 GHz with 6.00 GB RAM.
The computer randomly spikes up to
80%+ and usually higher than that and
the computer runs really slow. Ived
tried checking for spyware, or
anything and nothing is found. This
happens at idle and during normal
activity. Restarting usually solves
the issue but sometimes it doesnt.
what seems to have solved the issue was this hotfix:
Thanks alot! The hotfix did the job. I
was so tired of 100% Usage... thats
fixed now.
so, if your computer has an "NVIDIA USB Enhanced Host Controller Interface (EHCI) chipset" and "at least 4GB of RAM" and "you try to copy data from the computer to an external USB storage device" (i suppose, using a USB WLAN adapter qualifies for that too), then this might be the solution.
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