Higher CPU usage due to Deferred Procedure Calls (DPC)

[jberenyi]

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.

 

[zigzag3143]

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.

 

[jberenyi]

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.

 

[brady]

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.

 

[jberenyi]

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.

After work I will post. The one that caused me huge issues was the lastest driver for the Mosfet chip on my pci parallel card. It took me 3 hours to get it right and finally I just moved its location and now all is well. I even tried all filter resource methods for the port and no luck. I even changed port numbers and no good. When I knew this new driver file was causing me grief I reverted back to the old driver from 2006 but it still gave me hardware interupts issues with about 25% cpu usage. Last ditch effort was to move the darn card to a new slot on the motherboard and all is well now. I thought I was going to have to buy a different card or printer to fix the issue. Glad I didn't because those cards aren't cheap and I wasn't about to buy a new laserjet.

 

[brady]

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.

After work I will post. The one that caused me huge issues was the lastest driver for the Mosfet chip on my pci parallel card. It took me 3 hours to get it right and finally I just moved its location and now all is well. I even tried all filter resource methods for the port and no luck. I even changed port numbers and no good. When I knew this new driver file was causing me grief I reverted back to the old driver from 2006 but it still gave me hardware interupts issues with about 25% cpu usage. Last ditch effort was to move the darn card to a new slot on the motherboard and all is well now. I thought I was going to have to buy a different card or printer to fix the issue. Glad I didn't because those cards aren't cheap and I wasn't about to buy a new laserjet.

Ok, thanks. The above is the exact part of the update in which we wish to test. Thank you for your time.

 

[jberenyi]

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

 

[RLJ]

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.