diagnosing interrupt storms?

[Alfred Perlstein]

* Doug White <dwhite at gumbysoft.com> [040309 09:57] wrote:
> On Mon, 8 Mar 2004, Alfred Perlstein wrote:
> 
> > At a certain point after booting my SMP 5-current box gets all
> > weird, typically I see 50%+ time spent in interrupt.  If I run "top
> > -S" I typically see one of the ithreads using 50% cpu.
> >
> > I'm trying to figure out what it's doing, what has gone wrong etc.
> >
> > Are there any sysctls to look at or things I can do to diagnose
> > this?
> 
> vmstat -i is useful for figuring out exactly which interrupt is storming,
> although the ithread might hint it too.
> 
> Which one is it?

It's typically been em (intel gigE) or the sound interrupt.

-- 
- Alfred Perlstein
- Research Engineering Development Inc.
- email: bright at mu.org cell: 408-480-4684