Date: Mon, 22 Nov 2004 14:24:59 +0100
From: Ingo Molnar <mingo@elte.hu>
To: Rui Nuno Capela <rncbc@rncbc.org>
Cc: Florian Schmidt <mista.tapas@gmx.net>, 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>, Thomas Gleixner <tglx@linutronix.de>,
       Michal Schmidt <xschmi00@stud.feec.vutbr.cz>,
       Fernando Pablo Lopez-Lezcano <nando@ccrma.stanford.edu>,
       Karsten Wiese <annabellesgarden@yahoo.de>,
       Gunther Persoons <gunther_persoons@spymac.com>, emann@mrv.com,
       Shane Shrybman <shrybman@aei.ca>, Amit Shah <amit.shah@codito.com>,
       Esben Nielsen <simlo@phys.au.dk>
Subject: Re: [patch] Real-Time Preemption, -RT-2.6.10-rc2-mm2-V0.7.30-2
Message-ID: <20041122132459.GB19577@elte.hu>
References: <20041116125402.GA9258@elte.hu> <20041116130946.GA11053@elte.hu> <20041116134027.GA13360@elte.hu> <20041117124234.GA25956@elte.hu> <20041118123521.GA29091@elte.hu> <20041118164612.GA17040@elte.hu> <20041122005411.GA19363@elte.hu> <20041122020741.5d69f8bf@mango.fruits.de> <20041122094602.GA6817@elte.hu> <56781.195.245.190.93.1101119801.squirrel@195.245.190.93>
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* Rui Nuno Capela <rncbc@rncbc.org> wrote:

> > great. I now suspect that some of the xrun problems Rui was observing on
> > -RT kernel could be (positively) affected by these fixes too.
> >
> 
> Just made some test-runs with RT-V0.7.30-2, with my jackd-R +
> 8*fluidsynth benchmark on my laptop (P4/UP), and the results don't
> seem to be eligible to the hall of fame, at least when compared with
> RT-0.7.7 as the ones I last posted here a few weeks ago.
> 
> I hate to say this, but the XRUN rate has increased since RT-0.7.7,
> and the maximum scheduling delay reported by jackd has also degraded
> to 1000 usecs (was around 600 usecs).

well, life would be too easy if two bugs were fixed at once ;) These
were nodebug runs, right? Could you give me a description of the precise
commands of how you started jackd and fluidsyth (and their versions) -
so that i could try to reproduce & debug your setup. It is certainly a
complex scheduling scenario.

(perhaps with a link to the .sf2 and .mid files you used, if they are
public - or whether it's fine if i use the VintageDreamsWaves-v2.sf2
sound-fonts that comes with fluidsynth plus a random .mid file from the
net?)

> OTOH, there's another thing: I don't seem to be able to build an
> initrd image under the latest RT kernels. Something related to the
> loopback device. When trying to run mkinitrd it stalls, somewhere
> under this process:
> 
>   mount -t ext2 /root/tmp/initrd.img /root/tmp/initrd.mnt -o loop

Do you know when this started, roughly?

	Ingo
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