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Date: Mon, 16 Aug 2004 16:58:31 +0200
From: Ingo Molnar <mingo@elte.hu>
To: Thomas Charbonnel <thomas@undata.org>
Cc: Lee Revell <rlrevell@joe-job.com>, Florian Schmidt <mista.tapas@gmx.net>,
       linux-kernel <linux-kernel@vger.kernel.org>,
       Felipe Alfaro Solana <felipe_alfaro@linuxmail.org>
Subject: Re: [patch] voluntary-preempt-2.6.8.1-P2
Message-ID: <20040816145831.GA14195@elte.hu>
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* 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