Re: [gentoo-server] vmstat cs and in

[Matthias Bethke]

Hi Jeroen,
on Saturday, 2006-10-14 at 12:19:59, you wrote:
> >2) How high can these numbers be before a system admin should start
> >to worry about preformance?
> >
> Erm... they don't have much to do with performance, they just happen;
> if they didn't, you wouldn't have a working system... Just FYI: the
> 2.6 kernel uses a 1000Hz timer for the process scheduler, so expect to
> see at least 1000 interrupts per second no matter what else your
> system is doing.

Butting in quite late, but...
Remember that conversation we had in April?
(http://article.gmane.org/gmane.linux.gentoo.server/3907)
I was having terrible performance problems on my SMP box and solved them
by recompiling the kernel with 100 Hz ticks. 250 or 1000 Hz are fine if
you need low latency at the cost of throughput, like for audio
applications (250 even for general single-CPU desktops) but in some
configurations they can be deadly.
So there's no reason to be overly concerned with interrupts and context
switches if you're not having any performance problems but it can be worth
looking into if you do.

cheers!
	Matthias
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