weird interrupt load / exec behaviour

[Simon 'corecode' Schubert]

hey,

with my new athlon64 3200+ / NForce4 I am seeing a totally weird 
interrupt load when compiling.  Usually the load is at about 80% then 
and the box doesn't really compile much faster than my duron 1200 
before.

I've narrowed it down to exec.  If I write a program which does nothing 
but exec itself in a loop, I will get interrupt loads of > 90%.  I'm 
not sure if this is just accounting or real interrupt processing.  At 
the same time vmstat -i doesn't show more interrupts than usual.

It's really a pitty that it is so slow for compiling :/

I'll try a GENERIC kernel and a non-mcpu=athlon64 kernel later, but I 
doubt this helps.

Any clues?  Where could I start investigating?

cheers
  simon
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