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

MagicAndre1981
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hottroc

hottroc

Posted
Posted

Hi, no I don't but I use other sw that might be similar. The phrase SPTD driver rings a bell. I use or have used Ashampoo Burning Studio, DLA (not with W7), Roxio Easy Media Creator, UltraIso, Nero etc

Also programs like Paragon Partition Manager and there was another I had installed (name escapes me) for drive imaging for backup purposes.

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hottroc

hottroc

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I found this line in a OTL scan:

DRV - (sptd [boot | Running]) -- C:\Windows\sysnative\Drivers\sptd.sys ()

...which seems to indicate it IS running but I don't know why, what starts it or how to stop it.

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hottroc

hottroc

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Hi, well what I did, I downloaded the file as you recommended and when i ran it it obviously recognised I had an old version as it gave me the option to update the sptd.sys so i thought i'd try that (hopefully to avoid any of my progs not working).

Then I didn't want to speak too soon, I was waiting, and it got close to the point where i was going to say you had fixed it... But then unfortunately just now the problem re-occurred.

I will now try to disable it completely and try again but in the meantime I have uploaded a new etl file for your perusal. As far as I can tell the problem is the same..."UNKNOWN". Would you like to view the memory dump I saved before?

Here is the link for the ETL file:

http://cid-ac6270209775c627.skydrive.live.com/redir.aspx?resid=AC6270209775C627!162

Thanks again.

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hottroc

hottroc

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Hi, OK well it doesn't seem to be the sptd driver then because the problem still occurred.

As far as I am aware I already have the latest sound drivers available for my mb with my OS according to the Asrock website.

Do you have any other suggestions?

Thanks, really appreciate the help.

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rcollings

rcollings

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Hi MagicAndre (and everybody else) - I wonder whether you could help with my problem

I am having a problem with high CPU usage by DPCs. The problem is intermittent. It doesn't happen when the machine is idle but kicks in after a period of use and as I start to use more programs. It will go on for 5-10 mins and will some time stop by itself. It usually stops if I close down a few programs. It is not tied to any one program as far as I can see.

I have followed your diagnostic procedure (I think - not being a developer, I am not an expert in these matters).

The first problem I had was that I got a message saying "Session NT Kernal logger lost 2267 event" and that I need to increase the buffer size and/or number of buffers. Is this a problem and if so, how do I do this)

Secondly, when I get the graph, there is only activity for the first 10s and only a few percent of the CPU. I ran the logging process for a lot longer than this and the high CPU usage only kicked in after a while

Anyway, I selected the area where there was some activity and ran the analysis. Here's what I got:

post-322852-0-49451200-1303815299_thumb.

Is this any good? What does it mean? And what should I do next?

Many thanks for your help (in advance!)

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rcollings

rcollings

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Posted (edited)

add this to the command line to increase the buffersize:

-BufferSize 1024

the USB port driver has some issue. Which USB devices (HDD, USB flash drives) to you use?

Hi Andre - thanks for prompt rely.

Had rerun the trace for a shorter period when the DPC was already in progress and captured a trace without the error. Here is the resulting display:

post-322852-0-94282600-1303821647_thumb.

which is not dramatically differnt to the first one

So its something to do with my usb devices/drivers?

In answer to your question about USB devices - I have lots: external drives, sound cards, graphics tablets, mice, printers, etc, etc.

Its a Dell Latitude D820 laptop. Early on the process, when it looked like it might be the USB devices, I pulled out the two USB cables that connect to two hubs that connect most of my devices. The high CPU usage did not go away immediately so I assumed that it wasn't anything to do with USB. However....

1) Does disconnecting the device remove the driver? Or to put it another way, if I disconnect a device and the problem doesn't go away immediately, can I assume that that that device and driver are not the cause of the problem?

2) I think the laptop has a number of devices that are connected internally via USB. I am not sure how I identify these.

Incidentally, as far as I am aware, this is a new problem on an existing machine which did not have the problem before. As far as I am aware, I have not installed any new devices recently

Can you suggest some next steps to try and track the problem down. I have uploaded the trace file here:

trace file

Many thanks for your help (and for your guidelines)

Update: problem resolved. Turns out it was an external Creative USB Sound card. I went back and pulled out all the USB cables and this time I was specifically monitoring the processor usage by the DPCs rather than just looking at the overall CPU usage. As before the overall CPU usage remained high but the DPC usage dropped to zero. And then it was just a question of trying each device in turn until I found the one that restarted the DPC usage. Kicking myself now for not being more thorough in my my original testing - could have saved myself several hours. But your diagnostic tools pointed me firmly back at it being a USB device somewhere so we got there in the end. I was close to going out an buying a new machine - which I do need - but I can do so in a more measured fashion.

Many thanks

Richard

Richard

Edited by rcollings
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