Re: diagnosing interrupt storms?

From: Alfred Perlstein (alfred_at_freebsd.org)
Date: 03/09/04

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    Date: Tue, 9 Mar 2004 03:40:02 -0800
To: Scott Long <scottl@freebsd.org>

    * Scott Long <scottl@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@mu.org cell: 408-480-4684
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