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

It's an athlon 64 x2 6000+. I looked online and seems a few people with this chip have this problem when using the default heatsink.

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

Turns out RATTV3 doesn't work for XP x64. It refuses to generate the accumulator report. Plus the help file says it doesn't work with a 64 bit OS.

EDIT: Figured out the problem. MY PC throttles the CPU speed when it reaches 55°C. It reaches 55° pretty fast, too. Maybe an issue with my heat sink, or my CPU. Mystery solved at least!

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

All right, try this one.

http://www.mediafire.com/download.php?2k2b7wwa7n7ajnv

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

OK. I'm having an issue similar to the one described. But kind of different. Basically, when I am playing a game (even a really old one, Freespace 1 for example (it's from 1998) or an HD flash video, it will work fine for a couple minutes, then slow down dramatically for 5 to 10 seconds, then go back to normal again. And it'll do this every minute or so. During the slowdown, process explorer shows the application that's running jump up to 80% to 85% CPU usage, and the remaining 15% to 20% are taken up by Interrupts.

Here is a graph from process explorer:

This happens with both a pci express graphics card and an onboard graphics card.

HD videos using media player software work fine (tried media player classic, mplayer, and windows media player).

I use XP Pro x64, and don't have access to a win 7 or vista machine, which is most annoying because I'd like to look at what's happening. I did get the xperf software so could run the trace, and I was hoping it would be possible for you to take a look at it. I would if I could.

I have the etl file below. When I tried to run the x64 version of xperf, i got the error:

xperf warning: This system is not fully configured for x64 stack tracing. Please modify the registry under: HKLM\System\CurrentControlSet\Control\Session Manager\Memory Management and set the value: DisablePagingExecutive <reg_Dword> = 1

Then reboot before retrying tracing.

I also ran a trace of the x86 version of xperf and made the file below:

http://www.mediafire.com/download.php?k0hkqtc29832x9m

I did follow the directions of the x64 version and ran the trace after setting that registry value. Here is the etl of the x64 trace

http://www.mediafire.com/download.php?h4dh3u7qcc9fu49

I really thank you for making this thread, and sorry for asking you to look at the etl files.