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

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Date:	Sat, 8 Dec 2007 15:46:54 -0500
From:	"Parag Warudkar" <parag.warudkar@...il.com>
To:	"Ingo Molnar" <mingo@...e.hu>
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]

On Dec 8, 2007 3:11 PM, Ingo Molnar <mingo@...e.hu> wrote:
>
> * Parag Warudkar <parag.warudkar@...il.com> wrote:
>
> > But there are still fluctuations under 100% idle -
>
> do you have CONFIG_HIGH_RES_TIMERS=y?

Yes - NO_HZ=y  and HIGH_RES_TIMERS=y.
My ssh connection still died with hpet=disable although this time I
did not see soft lockup message.
Also it randomly gets stuck - suddenly there is a freeze and I can't
type for seconds.

> these fluctuations would still be OK if they are due to HZ granularity.
>

So are the hpet ones ok too or do they seem off even with HRTIMERS=y?
Just trying to figure out if I should be testing further with hpet
disabled or enabling it is ok.

Parag
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