linux-kernel - Re: frequent lockups in 3.18rc4

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Date:	Wed, 3 Dec 2014 16:19:57 -0800
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	Dave Jones <davej@...hat.com>, Chris Mason <clm@...com>,
	Mike Galbraith <umgwanakikbuti@...il.com>,
	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Dâniel Fraga <fragabr@...il.com>,
	Sasha Levin <sasha.levin@...cle.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	John Stultz <john.stultz@...aro.org>
Subject: Re: frequent lockups in 3.18rc4

On Wed, Dec 3, 2014 at 3:49 PM, Thomas Gleixner <tglx@...utronix.de> wrote:
>
> Bah. Would have been too simple ....

I do think you tend to trust the hpet too much.

Yes, we've had issues with people doing bad things to the tsc, but on
the whole I really would tend to trust the internal CPU counter a
_lot_ more than the external hpet.

So I think it's equally (if not more) likely that switching from tsc
to hpet causes trouble, because I'd trust the tsc more than the hpet.

DaveJ, do this:

> Could you please run Ingos time-warp test on that machine for a while?

but perhaps also boot with "tsc=reliable", which _should_ get rid of
that CLOCK_SOURCE_MUST_VERIFY, and the clocksource watchdog should do
nothing.

Thomas? Am I misreading that?

              Linus
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