From: Andi Kleen <ak@suse.de>
To: Mikael Pettersson <mikpe@csd.uu.se>
Cc: linux-kernel@vger.kernel.org, mmlnx@us.ibm.com
Subject: Re: nmi_watchdog default setting on i386 and x86_64
Date: 23 May 2006 16:37:57 +0200 [thread overview]
Message-ID: <p73psi46c3e.fsf@verdi.suse.de> (raw)
In-Reply-To: <17523.6413.711397.401340@alkaid.it.uu.se>
Mikael Pettersson <mikpe@csd.uu.se> writes:
> Mike Mason writes:
> > Does anybody know the reasoning behind having nmi_watchdog turned off by
> > default on i386 and on by default on x86_64. I've heard that i386 had
> > problems with false positives in the past, but that local apic watchdog
> > may make that concern obsolete.
>
> On i386 the problems are mainly hardware and BIOS. In particular,
> lots of Dell laptops have capable hardware but broken BIOSen that
> hang the machines if we try to enable anything sending performance
> counter interrupts via the local APIC.
AFAIK that trouble was mostly when you forced the local APIC on against
the wishes of the BIOS. That was always a dumb idea and gladly
Linux doesn't try that by default anymore.
-Andi
prev parent reply other threads:[~2006-05-23 14:38 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-05-22 23:48 nmi_watchdog default setting on i386 and x86_64 Mike Mason
2006-05-23 14:15 ` Mikael Pettersson
2006-05-23 14:37 ` Andi Kleen [this message]
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