linux-kernel - Re: [ANNOUNCE] 3.0.14-rt31 - ksoftirq running wild

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Message-ID: <1328128063.5882.80.camel@gandalf.stny.rr.com>
Date:	Wed, 01 Feb 2012 15:27:43 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Tim Sander <tim.sander@....com>
Cc:	RT <linux-rt-users@...r.kernel.org>,
	Mike Galbraith <efault@....de>,
	Tim Sander <tstone@....tu-darmstadt.de>,
	LKML <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Clark Williams <williams@...hat.com>,
	John Kacur <jkacur@...hat.com>,
	Gerlando Falauto <gerlando.falauto@...mile.com>,
	Micha Nelissen <micha@...i.hopto.org>,
	Holger Brunck <holger.brunck@...mile.com>
Subject: Re: [ANNOUNCE] 3.0.14-rt31 - ksoftirq running wild - FEC ethernet
 driver to blame? Yep

On Wed, 2012-01-25 at 10:31 +0100, Tim Sander wrote:

> Bad news, the ksoftirq(sirq-net-tx) error seems to happen not so often any 
> more but it still happens :-(.

Tim,

Is the system still usable when this happens? If so, can you configure
in ftrace, and run a trace on what ksoftirq is doing:

mkdir /debug
mount -t debugfs nodev /debug
cd /debug/tracing
echo <pid-of-ksoftirq> > set_ftrace_pid
echo function > current_tracer
cat trace

Thanks!

-- Steve


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