linux-kernel - Re: NOHZ: local_softirq

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Message-ID: <20120608083247.GA16529@sig21.net>
Date:	Fri, 8 Jun 2012 10:32:47 +0200
From:	Johannes Stezenbach <js@...21.net>
To:	Dave Jones <davej@...hat.com>
Cc:	Francois Romieu <romieu@...zoreil.com>,
	Marc Dionne <marc.c.dionne@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: NOHZ: local_softirq_pending 08

On Thu, Jun 07, 2012 at 10:34:20PM -0400, Dave Jones wrote:
> Ok. This was a bit of a pain to trace, as I can't trigger the NOHZ message
> when I bring up/down the interface by hand. It only seems to happen
> during boot now for some reason.

The message is only printed 10 times on each boot due to
the "ratelimit" in tick_nohz_stop_sched_tick.  I once debugged
an issue with rt2x00 (20ed3166c) and found that fairly confusing at first.

HTH
Johannes
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