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From: Andi Kleen <ak@colin2.muc.de>
To: Arjan van de Ven <arjanv@redhat.com>
Cc: Linus Torvalds <torvalds@osdl.org>, Andrew Morton <akpm@osdl.org>,
	Andi Kleen <ak@muc.de>,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH] Export touch_nmi_watchdog
Date: 5 Aug 2003 23:19:10 +0200
Date: Tue, 5 Aug 2003 23:19:10 +0200	[thread overview]
Message-ID: <20030805211910.GE31598@colin2.muc.de> (raw)
In-Reply-To: <20030805211554.B603@devserv.devel.redhat.com>

On Tue, Aug 05, 2003 at 09:15:54PM +0000, Arjan van de Ven wrote:
> On Tue, Aug 05, 2003 at 11:14:16PM +0200, Andi Kleen wrote:
> > > Otherwise this will just keep on expanding. 
> > 
> > It does expand on i386 exactly because the watchdog is disabled by default.
> > 
> > Looks like a mistake to me. It should be on because having usable backtraces
> > on a deadlock/hang is useful enough that it outweights any other possible
> > disadvantages. That's especially true for kernels out there at user's boxes,
> > not just special debugging kernels run by developers.
> > 
> > [if there should be any hardware where it doesn't work it should be blacklisted
> > there]
> 
> the reason it's off is that certain IBM bioses corrupt the eax register on
> NMI's when they collide with smm stuff... You'd be surprised how
> tolerant x86 is against such corruptions... but not 100%  :)

That could be catched by a dmi_scan.c entry ?

-Andi


  reply	other threads:[~2003-08-05 21:19 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2003-08-05 19:29 [PATCH] Export touch_nmi_watchdog Andi Kleen
2003-08-05 19:38 ` Andrew Morton
2003-08-05 20:08   ` Andi Kleen
2003-08-05 20:20     ` Arjan van de Ven
2003-08-05 20:25       ` Linus Torvalds
2003-08-05 20:31         ` Arjan van de Ven
2003-08-05 21:07           ` Linus Torvalds
2003-08-05 21:05             ` Tim Hockin
2003-08-05 21:14             ` Andi Kleen
2003-08-05 21:15               ` Arjan van de Ven
2003-08-05 21:19                 ` Andi Kleen [this message]
2003-08-05 22:14               ` Linus Torvalds
2003-08-06  0:07                 ` Andi Kleen
2003-08-06 11:06                   ` Ingo Oeser
2003-08-06 15:31                     ` Linus Torvalds
2003-08-05 20:45         ` Andi Kleen
2003-08-05 21:11       ` Andi Kleen

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