diagnosing interrupt storms?

[Alfred Perlstein]

* Scott Long <scottl at freebsd.org> [040309 00:08] 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?
> >
> > (also I my laptop still can't boot with top-of-the-tree current) :(
> >
> 
> A dmesg here would help, of course.  You might have a similar problem as
> me, where the SMI interrupt is misconfigured as active-low instead of
> active-high, so it storms the system.  Does disabling ACPI make a
> difference?  Since it's SMP, does disabling APIC (and thus turning it into
> UP) make a difference?

dmesg doesn't report anything out of the ordinary.

I will try your suggestions the next time I get wedged.

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