FreeBSD 6.2-PRE: Jumping box. Worse performance

[Kris Kennaway]

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
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