linux-kernel - Re: [patch] disable NMI watchdog by default

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Message-ID: <20070114144546.GC1268@khazad-dum.debian.net>
Date:	Sun, 14 Jan 2007 12:45:46 -0200
From:	Henrique de Moraes Holschuh <hmh@....eng.br>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [patch] disable NMI watchdog by default

On Sun, 14 Jan 2007, Ingo Molnar wrote:
> And with this my laptop (Lenovo T60) also stops its sporadic hard 
> hanging (sometimes in acpi_init(), sometimes later during bootup, 
> sometimes much later during actual use) as well. It hung with both 
> nmi_watchdog=1 and nmi_watchdog=2, so it's generally the fact of NMI 
> injection that is causing problems, not the NMI watchdog variant, nor 
> any particular bootup code.

I seem to recall a patch sent to lkml that removed nmi_watchdog
functionality from ThinkPads exactly because of this.  Something to do with
SMBIOS code calling int 10h under SMM, and that it would hang hard if NMIs
happened at that time.

-- 
  "One disk to rule them all, One disk to find them. One disk to bring
  them all and in the darkness grind them. In the Land of Redmond
  where the shadows lie." -- The Silicon Valley Tarot
  Henrique Holschuh
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