Re: [patch] PPC/PPC64 port of voluntary preempt patch

[Scott Wood]

On Wed, Aug 25, 2004 at 11:17:32PM -0400, Lee Revell wrote:
> I think Scott may be on to something.  There are several reports that P9
> does not work on SMP machines at all - it either doesn't boot, locks up
> the first time there is heavy IRQ activity (starting KDE), or locks up
> as soon as the first RT process is run.  This is exactly the behavior
> that would be expected if Scott is correct.  See this thread:
> 
> http://ccrma-mail.stanford.edu/pipermail/planetccrma/2004-August/005899.html
> 
> Does anyone have P9 working on SMP?  Fernando, can you see if M5 works
> on SMP?  If this works it would seem that the preemptible IRQs are the
> problem.

It worked for me on an SMP G5, but it would depend on which drivers
are used; some use synchronize_irq() more than others.

IIRC, though, M5 didn't have the IO-APIC fixes, so that's not likely
to work well on SMP either.

-Scott
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/