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Date: Wed, 1 Dec 2004 22:29:25 +0100
From: Ingo Molnar <mingo@elte.hu>
To: Rui Nuno Capela <rncbc@rncbc.org>
Cc: linux-kernel@vger.kernel.org, Lee Revell <rlrevell@joe-job.com>,
       mark_h_johnson@raytheon.com, "K.R. Foley" <kr@cybsft.com>,
       Bill Huey <bhuey@lnxw.com>, Adam Heath <doogie@debian.org>,
       Florian Schmidt <mista.tapas@gmx.net>,
       Thomas Gleixner <tglx@linutronix.de>,
       Michal Schmidt <xschmi00@stud.feec.vutbr.cz>,
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       Shane Shrybman <shrybman@aei.ca>, Amit Shah <amit.shah@codito.com>,
       Esben Nielsen <simlo@phys.au.dk>, Andrew Morton <akpm@osdl.org>
Subject: Re: [patch] Real-Time Preemption, -RT-2.6.10-rc2-mm3-V0.7.31-19
Message-ID: <20041201212925.GA23410@elte.hu>
References: <20041129152344.GA9938@elte.hu> <48590.195.245.190.94.1101810584.squirrel@195.245.190.94> <20041130131956.GA23451@elte.hu> <17532.195.245.190.94.1101829198.squirrel@195.245.190.94> <20041201103251.GA18838@elte.hu> <32831.192.168.1.5.1101905229.squirrel@192.168.1.5> <20041201154046.GA15244@elte.hu> <20041201160632.GA3018@elte.hu> <20041201162034.GA8098@elte.hu> <33059.192.168.1.5.1101927565.squirrel@192.168.1.5>
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* Rui Nuno Capela <rncbc@rncbc.org> wrote:

> > i think i found the bug - it's an upstream ACPI bug. Does the patch
> > below (or the -31-19 kernel, which i've just uploaded) fix the xruns?
> >
> 
> So far so good.
> 
> I have now an armed RT-V0.31-19 on my laptop, running for about 30
> minutes already, running the usual 'jackd -R -dalsa -dhw:0 -r44100
> -p64 -n2 -S -P' from qjackctl, several qsynth (fluidsynth) engines are
> up and running, normal desktop janitor work (KDE) and yes, ACPI is on.
> Oh, wi-fi is also pumping nice :)
> 
> Guess what? No XRUNs, not even one to show you a single latency trace.
> 
> I'll keep you posted, if anything goes less right than it is :).

great - it seems the ACPI fix made a difference. If there are no xruns
then you might want to try the # of engines at which point xruns show
up. (can the soundcard period size / buffering be reduced further, to
make it more sensitive to scheduling latencies?)

	Ingo