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

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Date:	Sat, 8 Dec 2007 12:51:44 -0800
From:	Arjan van de Ven <arjan@...radead.org>
To:	"Parag Warudkar" <parag.warudkar@...il.com>
Cc:	"Ingo Molnar" <mingo@...e.hu>,
	"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 Sat, 8 Dec 2007 15:46:54 -0500
"Parag Warudkar" <parag.warudkar@...il.com> wrote:

> 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.
> 

what chipset is this?
(I wonder if there's one where we shouldn't be force-enabling the hpet)
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