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Date: Tue, 29 Apr 2008 14:57:48 -0700
From: "Yinghai Lu" <yhlu.kernel@gmail.com>
To: "Eric W. Biederman" <ebiederm@xmission.com>
Subject: Re: [PATCH] x86: mtrr cleanup for converting continuous to discrete layout v5
Cc: "Andrew Morton" <akpm@linux-foundation.org>, "Ingo Molnar" <mingo@elte.hu>,
       "H. Peter Anvin" <hpa@zytor.com>,
       "Thomas Gleixner" <tglx@linutronix.de>,
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       "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
       "Mika Fischer" <mika.fischer@zoopnet.de>
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On Tue, Apr 29, 2008 at 1:29 PM, Eric W. Biederman
<ebiederm@xmission.com> wrote:
> "Yinghai Lu" <yhlu.kernel@gmail.com> writes:
>
>  > (less memory + fast X) or  (more 8M RAM + slow...)
>
>  Yes. That is the basic question.  Not all X drivers need it and
>  potentially the current kernel drm modules can use the
>  PAT infrastructure that has been merged.
>
>  Further a SMM monitor running 100 times or more slower may cause
>  problems if SMM mode is entered frequently, slowing down the entire
>  system not just X.
>
>  So if you don't have X or you have a crazy SMM monitor this can
>  be an issue.

agreed. so that feature is compiled in but disable by default.

BTW: is any chance for OS to disable SMI etc? to verify is the
unstatbility is caused by SMI?

YH