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Windows 7: System interupts causing high CPU usage, possibly from ataport.sys

07 May 2014   #11
Microsoft MVP

Vista, Windows7, Mint Mate, Zorin, Windows 8

Hmm, unfortunately in your case the latency checker was not very clear as to the causes. I am afraid you will have to follow the advice and eliminate one after the other driver by disabling it in the device manager. But it definitely seems to point to a driver problem.

My System SpecsSystem Spec
07 May 2014   #12

Windows 7 Home Premium 64bit

I have tried that, however, I could not isolate the cause. Here is what I noticed about the problem ( system interrupts using a high percentage of my processor):

1st) If I restart my computer I will not have any problems with system interrupts using a large percentage of my processor for 6-12 hours. After that it starts causing problems.

2nd) It only occurs when I open a program or there is a program actively running, if the program is idle there are no problems. Example when I run CCleanner, CC well use about 4 percent of my total processor and system interrupt wills use 100% of one core. When CC is done cleaning its processor usage drops below 1% and so does the processor usage of system interrupts.

It leads me to believe there is a driver or hardware problem with my hard drive, motherboard, memory, processor or something like that; these are all things that I cannot disable from device manager. Would that theory make sense?

I have ran a Chkdsk, memory diagnostics, updated my hard drive firmware. I can't update my BIOS because it is fully updated already.
My System SpecsSystem Spec
11 May 2014   #13

Windows 7 Home Premium 64bit

It has been 36 hours since the problem has occurred so I think it is fixed.

First off my problem (high CPU usage from System interrupts) occurred only when there was a high amount of disc usage, such as when copying files, opening a program or running a program that accesses the disk a lot when running, like a virus scan.

Here is what I did, though I am not sure exactly which fixed the problem.

I downloaded and ran Auslogics Registry cleaner, Auslogics Disk defragmenter, and Auslogics Registry Defragmenter. When running the Disk defragmenter, I selected the option to move system files to the front of the disc and ran the defrag and optimizer, as opposed to solely the defrag.

Then I ran Chkdsk using the following Administrator command prompt command: Chkdsk /f /r :C

After words, I downloaded Seatools from Seagate, and ran the Fix All long option on my hard drive.
My System SpecsSystem Spec


 System interupts causing high CPU usage, possibly from ataport.sys

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