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

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Date:	Tue, 29 Apr 2008 13:29:35 -0700
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	"Yinghai Lu" <yhlu.kernel@...il.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

"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.

Eric
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