Interrupt using all the CPU

[Daan Vreeken [PA4DAN]]

On Monday 03 July 2006 10:38, nocturnal wrote:
> Hi
>
> I'm having a few problems with a webserver. Today the idle was at 0.0
> and it's still like this. It doesn't look like it's affecting web
> services but it looks weird and i'm afraid that the CPU is working it's
> ass off with something. Of course nothing shows up in top or ps that
> could indicate which process is taking up all this cpu and since
> interrupt is the one using it i'm not even sure anything is actually
> using up CPU since i don't know what interrupt is. Any hints or pointers
> would be appreciated.
>
> It looks like interrupt and system are fighting for percents, interrupt
> has 100% constantly and as soon as interrupt drops system takes exactly
> what's left over and sometimes system doesn't do it so idle gets a few
> percents. It's weird to me simply because i can't find a description of
> what interrupt shows in top anywhere in the manuals.

Try "vmstat -i" to show you what device is causing the interrupts.

grtz,
Daan