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How to get the cause of high CPU usage by DPC / Interrupt


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the ATAport uses most CPU, but the following driver has the DPC latencies:

Total = 33 for module netbt.sys

Elapsed Time, > 1024 usecs AND <= 2048 usecs, 0, or 0.00%

Elapsed Time, > 2048 usecs AND <= 4096 usecs, 27, or 81.82%

Elapsed Time, > 4096 usecs AND <= 8192 usecs, 6, or 18.18%

netbt.sys is related to NetBIOS. Do you still use this? If not, disable it in the network connection options.

1 Interrupt is casued by this driver:

Total = 1075 for module i8042prt.sys

Elapsed Time, > 16384 usecs AND <= 32768 usecs, 1, or 0.09%

this is the PS/2 driver. Do you still use a PS/2 mouse or keyboard?

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I found the netbt.sys... but I am not sure what to change-

drv.jpg

I am guessing it's the part named 'Legacy'... although when I try to change that, it won't let me... it says "error when setting new value"

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I disabled the NetBIOS, and I've tried different mouse/keyboards with USB connection... still no difference.

I've made sure that my chipset and LAN drivers for my MOBO are up to date... the only thing I have NOT messed with is my BIOS... it just doesn't make sense that this would start happening out of no where due to BIOS... I'm using a version of BIOS that is a little over 2 years old now, and there haven't been any issues until a few days back.

Here is a new ETL file... maybe you can see something different here.

http://cid-c9365deeff3ffb21.office.live.com/self.aspx/New%20folder/DPC^_Interrupt.rar

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it is the same:

Total = 37 for module netbt.sys

Elapsed Time, > 4096 usecs AND <= 8192 usecs, 36, or 97.30%

Total = 63 for module i8042prt.sys

Elapsed Time, > 16384 usecs AND <= 32768 usecs, 2, or 3.17%

Elapsed Time, > 32768 usecs AND <= 65536 usecs, 3, or 4.76%

try to disable the lmhosts service.

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I use a USB mouse. I simply had it on a PS2 adapter.

I found an interesting/potential topic/reason here - does this sound/look like anything that might be going on with me? I have a similar graphics card

http://forum.sysinternals.com/hardware-interrupts-high-cpu-usage_topic12982_page1.html

This is old, but it might be something...

Edited by PJW
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