FreeBSD 6.2-PRE: Jumping box. Worse performance

Kris Kennaway kris at
Sat Nov 4 01:26:31 UTC 2006

On Sat, Nov 04, 2006 at 02:08:00AM +0100, O. Hartmann wrote:
> Kris Kennaway wrote:
> > On Fri, Nov 03, 2006 at 08:57:21PM +0100, O. Hartmann wrote:
> >   
> >> Compiling FreeBSD's world with make -j2 was never a problem while playing sound or doing other work on screen - but this seems to be a big problem now, even when SCHED_4BSD is used!
> >>
> >> While compiling world mouse stops and jumps, sound gets distorted. I recognise thsi behaviour also when box is doing minor HD access: mouse pointer stops, keyboard input gets stuck, sound stops playing, window operations (opening/closing) seems to freeze. This got even worse whithin the last two weeks (date when it starts getting this worse unknown).
> >> This phenomenon occurs on both i386 and amd64 but is much worse on amd64. On AMD64 very short and small HD activities seems to trigger this 'jumping' and stopping.
> >>
> >> Both boxes are singel core CPUs, AMD64 is a Athlon 3500+, i386 is a HTT enabled P4 at 3.0 GHz.
> >>
> >> I do not get any error or system fault, simply this jumping and freezing.
> >>
> >> On both systems PREEMPTION is enabled in the kernel, but the problem also occurs without this option.
> >>
> >> Any ideas, suggestion, maybe explanations?
> >>     
> >
> > Check for interrupt storms (vmstat -i).
> >
> > Kris
> >   
> Already already checked, nothing suspicious ...

Use top -S to check what is using the CPU.

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