linux-kernel - Re: [RFC Patch] use MTRR for write combining if PAT is not available

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Message-ID: <4AD229FA.7020104@linux.intel.com>
Date:	Sun, 11 Oct 2009 11:54:50 -0700
From:	Arjan van de Ven <arjan@...ux.intel.com>
To:	Henrique de Moraes Holschuh <hmh@....eng.br>
CC:	Thomas Schlichter <thomas.schlichter@....de>,
	linux-kernel@...r.kernel.org,
	Thomas Hellstrom <thellstrom@...are.com>
Subject: Re: [RFC Patch] use MTRR for write combining if PAT is not available

Henrique de Moraes Holschuh wrote:
> On Fri, 09 Oct 2009, Arjan van de Ven wrote:
>>> I've found a problem with X.org not setting up MTRR for the
>>> framebuffer memory. After I investigated I think this is not a
>>> X.org problem, but a kernel issue.
>> is there any CPU left that does not support PAT ?
> 
> A few million of them.  Like every Centrino laptop out there, unless the
> kernel blacklist for PAT on Intel CPUs is wrong.

afaik it is extremely conservative right now. FAR too much so.

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