2.4.19 on dual 1gig G4 funny slow down to kernel death experience

Benjamin Herrenschmidt benh at kernel.crashing.org
Sun Feb 9 00:27:54 EST 2003

On Fri, 2003-02-07 at 22:29, Kevin B. Hendricks wrote:

> I just experienced the funny slow down until kernel death experience again
> that I reported many months ago on my dual 1gig G4 machine (smp with 768
> meg of memory)
> The dmesg log is full of a long stream of the following
> wait_on_irq, CPU 0:
> irq:  -1 [0 0]
> bh:   0 [0 0]

Argh !

The global irq count should never _ever_ get to -1, that's very bad...

Either some weird codepath I haven't manage to figure out, or,
and that's what I'm afraid of, for some reasons, atomic operations
between CPUs failed, which should obviously never happen !

Remind me which rev of the CPU it is ?


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