diagnosing interrupt storms?

[Alfred Perlstein]

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) :(

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