Date: Thu, 18 Nov 2004 10:57:42 +0100
From: Ingo Molnar <mingo@elte.hu>
To: "K.R. Foley" <kr@cybsft.com>
Cc: linux-kernel@vger.kernel.org, Lee Revell <rlrevell@joe-job.com>,
       Rui Nuno Capela <rncbc@rncbc.org>, Mark_H_Johnson@Raytheon.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>,
       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>
Subject: Re: [patch] Real-Time Preemption, -RT-2.6.10-rc2-mm1-V0.7.28-0
Message-ID: <20041118095742.GB16054@elte.hu>
References: <20041108091619.GA9897@elte.hu> <20041108165718.GA7741@elte.hu> <20041109160544.GA28242@elte.hu> <20041111144414.GA8881@elte.hu> <20041111215122.GA5885@elte.hu> <20041116125402.GA9258@elte.hu> <20041116130946.GA11053@elte.hu> <20041116134027.GA13360@elte.hu> <20041117124234.GA25956@elte.hu> <419C0B26.9070607@cybsft.com>
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* K.R. Foley <kr@cybsft.com> wrote:

> I know I am late reporting this but I didn't figure it out until late
> this afternoon. I had trouble booting this one on my SMP workstation
> at the office. It would hang after it had almost finished booting.
> Anyway the solution was to disable tracing in /etc/rc.local and then
> re-enable it after it has finished booting. I know this happens late
> in the boot but it works for me.
> 
> echo 0 > /proc/sys/kernel/trace_enabled
> #echo 0 > /proc/sys/kernel/preempt_wakeup_timing
> #echo 50 > /proc/sys/kernel/preempt_max_latency
> 
> To be honest I am not sure which of the above fixes the late boot hang
> and I didn't have time to figure it out either. This doesn't happen on
> my SMP system here.

there's a generic bug i'm chasing right now that seems to get worse with
tracing enabled. The symptom of the bug is typically a system hang.

	Ingo
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