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Date: Fri, 29 Oct 2004 16:25:38 +0200
From: Ingo Molnar <mingo@elte.hu>
To: Florian Schmidt <mista.tapas@gmx.net>
Cc: Rui Nuno Capela <rncbc@rncbc.org>, 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>
Subject: Re: [patch] Real-Time Preemption, -RT-2.6.9-mm1-V0.4
Message-ID: <20041029142538.GC25204@elte.hu>
References: <20041027205126.GA25091@elte.hu> <20041027211957.GA28571@elte.hu> <33083.192.168.1.5.1098919913.squirrel@192.168.1.5> <20041028063630.GD9781@elte.hu> <20668.195.245.190.93.1098952275.squirrel@195.245.190.93> <20041028085656.GA21535@elte.hu> <26253.195.245.190.93.1098955051.squirrel@195.245.190.93> <20041028093215.GA27694@elte.hu> <43163.195.245.190.94.1098981230.squirrel@195.245.190.94> <20041029163135.1886d67f@mango.fruits.de>
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* Florian Schmidt <mista.tapas@gmx.net> wrote:

> Here's some setup info:
> 
> ksoftirqd/0:
> mango:~# chrt -p 2
> pid 2's current scheduling policy: SCHED_FIFO
> pid 2's current scheduling priority: 99

dont do this ... ksoftirqd can spend alot of time processing various
stuff and it should not be relevant to the audio path. It should be
SCHED_OTHER.

> Hmm, it seems i haven't disabled all debugging. This is from dmesg:
> 
> BUG: atomic counter underflow at:
>  [<c010649e>] dump_stack+0x1e/0x20 (20)
>  [<c025f319>] qdisc_destroy+0xd9/0xe0 (28)

this is automatic and doesnt introduce alot of overhead (unless the
printout happens while you are testing latencies). You can remove the
WARN_ON from include/asm-i386/atomic.h.

	Ingo
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