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Windows 7: Deferred Procedure Calls and Interrupt Service Routines High CPU

01 Dec 2011   #1

Windows 7 Ultimate x64
Deferred Procedure Calls and Interrupt Service Routines High CPU


Recently I have noticed higher than normal CPU usage from my laptop which I know will reduce battery life, cause higher temperatures and slow the computers performance.

The task manager did not tell me too much so I decided to have a look in the Resource Manager.
Sure enough under the CPU tab of the Resource Manager there is a process called System Interrupts that has a description of "Deferred Procedure Calls and Interrupt Service Routines" with a average CPU usage of about 30%.

I did notice that when I first turn my laptop on and boot in to Windows that this process uses about 1 - 5 % CPU usage and my temperatures stay at about 28 - 32 degrees Celsius.

Usually after some time of using the laptop I notice this temprature rises to about 48 - 54 degrees Celsius and when I check the process it is using around 30% CPU usage, usually to resolve this I restart my laptop and everything goes back to normal and the process is back down to 1 - 5 % CPU usage.

I done a little research online and found that clean boot of Windows may solve the problem, I did this then re-installed all the required drivers from my system manufacturer, installed Avast Antivirus Pro then done a Windows Update.

Surely soon after I notice the same problem again, it may happen the same day I boot up the laptop or it may happen in a day or so, there is no set time when this happens and haven't noticed anything that I am doing that could trigger off this problem.

Kind Regards,

My System SpecsSystem Spec

04 Dec 2011   #2

Windows 7 Ultimate x64

I know I probably shouldn't do this though I'm bumping this since I edited the complete question.
My System SpecsSystem Spec

 Deferred Procedure Calls and Interrupt Service Routines High CPU

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