linux-kernel - Re: [PATCH] x86: mtrr cleanup for converting continuous to discrete layout v5

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Message-ID: <86802c440804291457k79099d84w53110fabf59e9e37@mail.gmail.com>
Date:	Tue, 29 Apr 2008 14:57:48 -0700
From:	"Yinghai Lu" <yhlu.kernel@...il.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Ingo Molnar" <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
	"Thomas Gleixner" <tglx@...utronix.de>,
	"Gabriel C" <nix.or.die@...glemail.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Mika Fischer" <mika.fischer@...pnet.de>
Subject: Re: [PATCH] x86: mtrr cleanup for converting continuous to discrete layout v5

On Tue, Apr 29, 2008 at 1:29 PM, Eric W. Biederman
<ebiederm@...ssion.com> wrote:
> "Yinghai Lu" <yhlu.kernel@...il.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
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