System Cpu Between 50-70% and need to find out why

Max Laier max at
Mon Apr 23 00:07:22 UTC 2007

On Monday 23 April 2007 00:52, Paul wrote:
> >Uh you had the right idea but forgot to paste the relevant bits ;-)
> >
> >top *is* the tool for working out what processes are using your CPU.
> >Although your high load average suggests that your system is just
> >heavily loaded and it is expected that it will be using 100% CPU.
> >
> >Kris
> Dear Kris,
> Thanks for your e-mail.
> The odd thing is that I just switched from an old 4.12 box with dual
> xeon (only 2 processors) with 4 gb of ram to the 6.2 with the extra
> ram and dual core dual zeons (technically twice the cpus:) and 4* the
> ram....
> This one is dying and the other older "so called slower" system works
> much better with as close to the same configuration as I can make it.
> I have to assume something is wrong here but I will keep digging as
> this is not even workable.
> The system cpu is still high if I get rid of the memory drive and
> have it save on the disks. It takes a lifetime to build a kernel now...
> Any way I can view what is made up of the 50-70% system cpu to be
> able to pinpoint the bottleneck?
> I have tried to trim down the ipfw rules to see if this was the
> culprit but this does not seem to be making a difference so far.

"vmstat -i" could help to rule out interrupt storms.  "top -S" will show 
in-kernel threads as will "systat".  Maybe these help.

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