Message-ID: <4AD229FA.7020104@linux.intel.com>
Date: Sun, 11 Oct 2009 11:54:50 -0700
From: Arjan van de Ven <arjan@linux.intel.com>
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To: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
CC: Thomas Schlichter <thomas.schlichter@web.de>, linux-kernel@vger.kernel.org,
       Thomas Hellstrom <thellstrom@vmware.com>
Subject: Re: [RFC Patch] use MTRR for write combining if PAT is not available
References: <200910100322.36857.thomas.schlichter@web.de> <4AD00C89.3000503@linux.intel.com> <20091011185114.GB18578@khazad-dum.debian.net>
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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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