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

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Date:	Tue, 17 Jan 2012 09:42:05 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Tim Sander <tstone@....tu-darmstadt.de>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Tim Sander <tim.sander@....com>,
	LKML <linux-kernel@...r.kernel.org>,
	RT <linux-rt-users@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Clark Williams <williams@...hat.com>,
	John Kacur <jkacur@...hat.com>
Subject: Re: [ANNOUNCE] 3.0.14-rt31 - ksoftirq running wild - FEC ethernet
 driver to blame?

On Tue, 2012-01-17 at 15:27 +0100, Tim Sander wrote:
> Hi
> 
> I have further input to the ksoftirq/0 using as much cpu as available on a
> arm i.mx pcm043 platform without load with a 3.0.14-rt31 kernel and some local 
> platform adaptions.
> 
> > I was thinking about this ksoftirq0 running on max cpu. The context:
> > > > > and the running wild ksoftirqd0 most probably after the kernel
> > > > > message: "sched: RT throttling activated"

> I think that the message  "sched: RT throttling activated" and the ksoftirqd 
> running on full cpu are possibly to seperate errors. Btw. is there a way to 
> find out which processes where conuming this timeframe. It would be nice to add 
> info output which processes caused the throtteling. Is it possible to get this 
> information out of the scheduler structure?
> 

Peter,

This is your territory.

-- Steve


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