Re: diagnosing interrupt storms?

From: Doug White <dwhite_at_gumbysoft.com>
Date: Tue, 9 Mar 2004 09:57:17 -0800 (PST)
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?

-- 
Doug White                    |  FreeBSD: The Power to Serve
dwhite_at_gumbysoft.com          |  www.FreeBSD.org
Received on Tue Mar 09 2004 - 08:57:18 UTC

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