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DPC (Deferred Procedure Calls)
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Eric66 View Drop Down
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Joined: 14 August 2005
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Posts: 1 		  Quote Eric66 Quote  Post ReplyReply Direct Link To This Post Topic: DPC (Deferred Procedure Calls)
    Posted: 14 August 2005 at 5:59pm

Hi,

I have a new computer with Win XP SP2 and a P4D (Dual core) 3 GHz (Asus P5WD2 Premium).

It seems that a driver blocks my computer. I have a CPU Usage from 40% without doing something. The taskmanager shows no process which use more than 1 % (the most has the system idle process).

When I look in the Process Explorer, I see that the DPC are high, more than 40% CPU time. The second core of the CPU has nearly no usage.

How I can tell which driver use this CPU time?

Thanks

Eric
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pblumo View Drop Down
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Joined: 08 August 2005
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Posts: 3 		  Quote pblumo Quote  Post ReplyReply Direct Link To This Post Posted: 16 August 2005 at 12:05pm
with kernrate ? (2003 ressource kit)
Pierre-Olivier BLU-MOCAER
Technical Account Manager - Windows Server Team
SG Corporate & Investment Banking
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raven4281 View Drop Down
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Joined: 19 August 2005
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Posts: 1 		  Quote raven4281 Quote  Post ReplyReply Direct Link To This Post Posted: 19 August 2005 at 1:49pm
Originally posted by Eric66

Hi,

I have a new computer with Win XP SP2 and a P4D (Dual core) 3 GHz (Asus P5WD2 Premium).

It seems that a driver blocks my computer. I have a CPU Usage from 40% without doing something. The taskmanager shows no process which use more than 1 % (the most has the system idle process).

When I look in the Process Explorer, I see that the DPC are high, more than 40% CPU time. The second core of the CPU has nearly no usage.

How I can tell which driver use this CPU time?

Thanks

Eric



I am having a similar problem with a 3.06 hyperthreading intel cpu.  As soon as I open more than one program, the cpu speed spikes to 40-50 and stays like that.  Any insight onwhat could be causing this?

Thanks


Edited by raven4281
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Der_KHAN View Drop Down
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Joined: 20 August 2005
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Posts: 2 		  Quote Der_KHAN Quote  Post ReplyReply Direct Link To This Post Posted: 20 August 2005 at 3:27pm
same here on a notebook with pentium 4M 2.20 running XPSP1
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ZeroDan View Drop Down
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Posts: 20 		  Quote ZeroDan Quote  Post ReplyReply Direct Link To This Post Posted: 21 August 2005 at 1:31am

Start by creating Performance Monitor logs which can be used to diagnose the problem. The next step is to identify which process is causing the issue. I've written an article that highlights some of the steps that need to be taken, http://sandbox.zeroaffinity.com/2005/07/26/5.

Once there's some logs available I'm happy to assist with further troubleshooting.
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Toke View Drop Down
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Joined: 22 August 2005
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Posts: 4 		  Quote Toke Quote  Post ReplyReply Direct Link To This Post Posted: 22 August 2005 at 3:18am
At last I find a place where others have the same problem...

I have exactly the same thing on a Dell Dimension 8400, P4 3.4 GHz HT. DPCs using up 20-40% CPU usage constantly. I have nailed it down to being a graphic card (driver?) problem. This is a PCI-express Nvidia 6800, 256MB. When I uninstall the drivers and restart, the computer (and CPU) behaves normally, but as soon as I reinstall the drivers, CPU usage runs up to 20-40% again. I have tried a multitude of drivers from Dell and Nvidia, both the latest ones and a couple of earlier ones (dating from to october 2004 and onwards), but all result in the same behaviour. I have also updated to the latest chipset drivers from Intel. Can it be a hardware problem? Or can the graphic card drivers be in conflict with drivers for another hardware component? I can see no conflicts (IRQ/DMA) or such in the hardware manager.

/Toke
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jabroni_83 View Drop Down
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Joined: 23 August 2005
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Posts: 1 		  Quote jabroni_83 Quote  Post ReplyReply Direct Link To This Post Posted: 23 August 2005 at 4:39am
i'm having exactly the same problem by the sound of it.
i'm running an x2 3800 on epox 9npa sli mobo with a geforce 6800 and having dpc taking up 50% of my cpu usage all the time.

i have no idea why!
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Trilithon View Drop Down
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Posts: 1 		  Quote Trilithon Quote  Post ReplyReply Direct Link To This Post Posted: 25 August 2005 at 8:16am
hmm.. to add to the mysteria...

tyan k8we, dual opterons, geforcegt, 8 GB Ram...

triple boot system: xp32bit, xp64bit, w2k3 64bit..

no additional drivers except areca sata raid driver... which is the same for xp64bit and w2k3 64bit...

xp (both) show 100% Util on the second CPU, ACPI.SYS and DPC causing this...

w2k3 has no problems... w2k3 was changed to support directx and work more like a workstation..

than..... the 100% is gone for 2 weeks.... but... it is back...

I didn't change anything myself... AFAIK w2k3 64bit and xp64 should have similar / same codebase..

I would really like to see a solution to that problem...
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Toke View Drop Down
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Joined: 22 August 2005
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Posts: 4 		  Quote Toke Quote  Post ReplyReply Direct Link To This Post Posted: 25 August 2005 at 8:23am
Has anyone solved this problem yet? I have spent several days on my issue, without getting much closer. I have reinstalled WinXP, both Home and Pro, a copule of times, but without resolving the intermittent high DPCs periods. I have the problem mostly during and immediately after windows startup (high CPU loading lasting 2-10 minutes), but occasionally at intervals also later (same time duration). Interestingly, the problem do not occur after a complete clean install, with only WinXP and chipset drivers installed, but as soon as I install the graphic drivers, it is there again. Can anyone else see if their graphic board is the problem. Do anyone else of you above have a GeForce 6800?
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sir_isaac View Drop Down
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Joined: 26 August 2005
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Posts: 2 		  Quote sir_isaac Quote  Post ReplyReply Direct Link To This Post Posted: 26 August 2005 at 11:47pm
I am having the same problem - Dell 8400 with GeForce 6800 card. I was told Dell is behind on the nVidia drivers and to install the latest directly from nvidia.  My driver from dell in May was 6.6.8.4, the latest download from nv is 7.7.7.7.  I *just* did this, so will wait a day or two to see if it had any affect.  Will let you know....
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