Windows 7 Forums
Welcome to Windows 7 Forums. Our forum is dedicated to helping you find support and solutions for any problems regarding your Windows 7 PC be it Dell, HP, Acer, Asus or a custom build. We also provide an extensive Windows 7 tutorial section that covers a wide range of tips and tricks.


Windows 7: Higher CPU usage due to Deferred Procedure Calls (DPC)

10 Feb 2010   #1
jberenyi

Windows 7 X64 Home Premium
 
 
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.


My System SpecsSystem Spec
.
10 Feb 2010   #2
zigzag3143

Win 8 Release candidate 8400
 
 

Quote   Quote: Originally Posted by jberenyi View Post
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.
My System SpecsSystem Spec
11 Feb 2010   #3
jberenyi

Windows 7 X64 Home Premium
 
 

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.
My System SpecsSystem Spec
.

11 Feb 2010   #4
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.
My System SpecsSystem Spec
11 Feb 2010   #5
jberenyi

Windows 7 X64 Home Premium
 
 

Quote   Quote: Originally Posted by brady View Post
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.
My System SpecsSystem Spec
11 Feb 2010   #6
brady

 

Quote   Quote: Originally Posted by jberenyi View Post
Quote   Quote: Originally Posted by brady View Post
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.
My System SpecsSystem Spec
13 Feb 2010   #7
jberenyi

Windows 7 X64 Home Premium
 
 

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
My System SpecsSystem Spec
25 Oct 2012   #8
RLJ

Windows 7 Ultimate x86
 
 
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.
My System SpecsSystem Spec
Reply

 Higher CPU usage due to Deferred Procedure Calls (DPC)




Thread Tools




Similar help and support threads
Thread Forum
explorer.exe higher than normal mem usage
Normally explorer.exe should have something like 12,000 K memory used at boot and rise to around just under 50,000 K as you do stuff on the computer, at least mine used to. Now the one explorer.exe is hovering around 77,000 K and I've seen it as high as 102,000 K. This happened once before but it...
Performance & Maintenance
Higher Ram Usage in Svchost and Updates - way to view service ram?
Ive noticed my ram usage is up more than normal, usage up 400-600MB. (Total 8gb.) This usage came about as some batch of windows updates lately. I have noticed inflated svchost processes. Currently the largest process I have is usage 194MB, and is an svchost. It had been 370MB, but I stopped the...
Performance & Maintenance
Deferred Procedure Calls and Interrupt Service Routines High CPU
Hello, 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...
Performance & Maintenance
Getting Deferred Procedure Calls and System Interrupts - Please Help
Getting Deferred Procedure Calls and System Interrupts - Please Help Issue occured after I perform input/output (I/O) operations from a Toshiba storage device External Storage device file movement input through USB Hard drive adapter: Manufacturer: Sabrent -UBS 2.0 to SATA Hard Drive Adapter...
Performance & Maintenance
Higher CPU usage comparing to XP
I just installed the latest seven release... I also installed the following softwares: Chrome browser and VLC. I opened a movie with VLC and paused it. Chrome has couple of tabs open, google pages and this message board. While my computer is IDLE, chrome is at constant 1-5%cpu usage. while...
Performance & Maintenance


Our Sites

Site Links

About Us

Find Us

Windows 7 Forums is an independent web site and has not been authorized, sponsored, or otherwise approved by Microsoft Corporation. "Windows 7" and related materials are trademarks of Microsoft Corp.

Designer Media Ltd

All times are GMT -5. The time now is 00:18.
Twitter Facebook Google+ Seven Forums iOS App Seven Forums Android App