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Subject: Re: [patch] voluntary-preempt-2.6.8.1-P2
From: Thomas Charbonnel <thomas@undata.org>
To: Ingo Molnar <mingo@elte.hu>
Cc: Lee Revell <rlrevell@joe-job.com>, Florian Schmidt <mista.tapas@gmx.net>,
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       Felipe Alfaro Solana <felipe_alfaro@linuxmail.org>
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Ingo Molnar wrote :
> * Thomas Charbonnel <thomas@undata.org> wrote:
> 
> >  0.000ms (+0.000ms): do_IRQ (default_idle)
> >  0.000ms (+0.000ms): mask_and_ack_8259A (do_IRQ)
> >  0.459ms (+0.459ms): generic_redirect_hardirq (do_IRQ)
> >  0.459ms (+0.000ms): generic_handle_IRQ_event (do_IRQ)
> >  0.459ms (+0.000ms): timer_interrupt (generic_handle_IRQ_event)
> 
> > It definitely looks like the kernel is interrupted by some interrupt
> > source not covered by the patch.
> 
> the only possibility is SMM, which is not handled by Linux. (but by the
> BIOS.) Otherwise we track everything - including NMIs.
> 
> can you reproduce this using an UP kernel too?
> 
> 	Ingo

I'm currently not using SMP :

root@satellite linux # grep SMP .config
CONFIG_BROKEN_ON_SMP=y
# CONFIG_X86_BIGSMP is not set
# CONFIG_SMP is not set

Whole .config here:
http://www.undata.org/~thomas/config-2.6.8-P2

This would confirm the hypothesis of a buggy BIOS, I'm afraid.

Thomas