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From: Nikos Vassiliadis <nvass@teledomenet.gr>
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Date: Mon, 3 Jul 2006 15:04:38 +0300
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Cc: "Daan Vreeken \[PA4DAN\]" <Danovitsch@vitsch.net>,
	nocturnal <nocturnal@swehack.se>
Subject: Re: Interrupt using all the CPU
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On Monday 03 July 2006 14:06, Daan Vreeken [PA4DAN] wrote:
> On Monday 03 July 2006 12:26, nocturnal wrote:
> > Hi
> >
> > The clock?
> >
> > interrupt                          total       rate
> > irq0: clk                       25130235         99
> > irq1: atkbd0                           4          0
> > irq6: fdc0                             1          0
> > irq7: ppc0                             1          0
> > irq8: rtc                         288300          1
> > irq11: atapci1                    637852          2
> > irq12: vr0 uhci0+                3890833         15
> > irq13: npx0                            1          0
> > irq14: ata0                           54          0
> > Total                           29947281        119
>
> Hmm.. There seems to be nothing wrong with these numbers. If you were
> suffering from an interrupt storm I would have expected much larger numbers
> in the "rate" column. The column "rate" shows the average number of
> interrupts / second. In total your system handles about 120 interrupts /
> second, so that shouldn't be a problem.

I have the feeling that rate is calculated like this:
number of interrupts since boottime / seconds of uptime

so, this won't help if his is having now an interrupt storm
while most of the time the system is interrupted ~ 120 times
per second

systat -vmstat $time shows interrupts per second regarding the last $time 
seconds