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Date: Wed, 15 Sep 2004 10:53:25 +0100 (WEST)
Subject: Re: [patch] voluntary-preempt-2.6.9-rc1-bk12-R5
From: "Rui Nuno Capela" <rncbc@rncbc.org>
To: "Ingo Molnar" <mingo@elte.hu>
Cc: "Lee Revell" <rlrevell@joe-job.com>,
       "Florian Schmidt" <mista.tapas@gmx.net>, "K.R. Foley" <kr@cybsft.com>,
       "linux-kernel" <linux-kernel@vger.kernel.org>,
       felipe_alfaro@linuxmail.org
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Hi Ingo,

Ingo Molnar wrote:
>
>Rui Nuno Capela wrote:
>
>> b) When CONFIG_SCHED_SMT is not set, I can run all along with
>> softirq-preempt=1, hardirq-preempt=1 et al. While running jackd in
>> realtime mode, I get NO hard-locks, but unfortunately XRUNs are
>> plenty. A real storm. However I've noticed that the whole seems pretty
>> much stable, as I didn't experience one single system hang. Regression
>> to softirq-preempt=0 and hardirq-preempt=0 dissolves the xrun storm to
>> nothing again.
>
> when you set softirq-preempt=1 and hardirq-preempt=1 then you also need
> to make the soundcard's IRQ non-threaded via /proc/irq/*/*/threaded
> (pick the right one that is your soundcard). E.g. i have a CMI8738-MC6
> on IRQ11, so i'd have to do this:
>
> 	echo 0 > /proc/irq/11/CMI8738-MC6/threaded
>
> to mark the soundcard's interrupt as directly-executed.
>

Yes, I didn't mentioned that, but I do have provided it and assumed on all
my reported trials:

    echo 0 > "/proc/irq/8/rtc/threaded"
    echo 0 > "/proc/irq/17/Intel ICH5/threaded"

Thanks.
-- 
rncbc aka Rui Nuno Capela
rncbc@rncbc.org

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