linux-kernel - Re: soft lockup - CPU#1 stuck for 15s! [swapper:0]

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Message-ID: <20071208191330.GA21186@elte.hu>
Date:	Sat, 8 Dec 2007 20:13:30 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Parag Warudkar <parag.warudkar@...il.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	"Pallipadi, Venkatesh" <venkatesh.pallipadi@...el.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: soft lockup - CPU#1 stuck for 15s! [swapper:0]


* Parag Warudkar <parag.warudkar@...il.com> wrote:

> >    while :; do time usleep 1111111; done
> >
> > or do these sleeps fluctuate?
> 
> They seem to fluctuate - not sure if that's supposed to be exact or if 
> below variations are normal - This is when my compiles are running -

it's normal for them to fluctuate a little when load goes up and the 
task gets delayed.

'bad' fluctuations are ones that happen when the system is idle.

	Ingo
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