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10 Feb 2010 | #1 |
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Higher CPU usage due to Deferred Procedure Calls (DPC)
Running Windows 7 64-bit and just downloaded the lastest updates from Microsoft last night. Now my CPU is sitting at 20% due to Deferred Procedure Calls and Interupt Service Providers running constantly according to the resource monitor. What could cause this issue? Could it be a driver that downloaded from MS? I believe the fix for this would be to just restore back to before the install but I have a question about restore points. When I open up the restore point menu and it shows all the dates, do I pick the date of the MS update or one day earlier? I always wondered the answer to this question.
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10 Feb 2010 | #2 |
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Running Windows 7 64-bit and just downloaded the lastest updates from Microsoft last night. Now my CPU is sitting at 20% due to Deferred Procedure Calls and Interupt Service Providers running constantly according to the resource monitor. What could cause this issue? Could it be a driver that downloaded from MS? I believe the fix for this would be to just restore back to before the install but I have a question about restore points. When I open up the restore point menu and it shows all the dates, do I pick the date of the MS update or one day earlier? I always wondered the answer to this question.
Pick the most recent before the updates were downloaded. |
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11 Feb 2010 | #3 |
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Found the problem. It was my PCI Parallel card for the printer. I had to relocate it to a different slot and now all is well. It just didn't like that particular slot.:)
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11 Feb 2010 | #4 |
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shouldn't be the "slot" having the problem. The latest versions of the windows updates are causing all sorts of problems. I'm curious to see what updates you downloaded / installed last night. If you can, please screen shot the latest updates you installed for me... If you have time.
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11 Feb 2010 | #5 |
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shouldn't be the "slot" having the problem. The latest versions of the windows updates are causing all sorts of problems. I'm curious to see what updates you downloaded / installed last night. If you can, please screen shot the latest updates you installed for me... If you have time.
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11 Feb 2010 | #6 |
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shouldn't be the "slot" having the problem. The latest versions of the windows updates are causing all sorts of problems. I'm curious to see what updates you downloaded / installed last night. If you can, please screen shot the latest updates you installed for me... If you have time.
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13 Feb 2010 | #7 |
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Here you go Brady. The ones loaded on 2/10/2010 was the latest. Keep in mind though, that the driver I spoke of was never listed in the list of updates. It was considered an optional update and I let it install. BTW, I am still having no issues since doing what I said to prevent the hardware interrupt issues taking 25% of my CPU when using the HP Laserjet printer. The culprit driver is seen in update3 link below.
http://www.taclatch.com/update1.jpg http://www.taclatch.com/update2.jpg http://www.taclatch.com/image3.jpg |
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25 Oct 2012 | #8 |
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Solved on my system
In Layman terms.....It was the Firewire IEEE1394 OCHI Compliant Host controller,I disabled it in device manager and CPU useage dropped 30+ percent.
I read that DPC's and Sys Interrupts run after higher piority calls have been handled, as I dont use firewire...You get my drift. AS it was,My system would run fine 15% CPU useage then hours later jump up to 50% plus. I disabled devices not in use like COM ports, floppy,etc. and eventually Firewire, rather than messing with my drivers. When I do use the port, its easy to reenable and then I don't get any problems,as the port is in use. Hope this helps someone. 985 days no posts, like the problem just went away. |
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