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

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Date:	Sun, 11 Oct 2009 17:19:53 -0300
From:	Henrique de Moraes Holschuh <hmh@....eng.br>
To:	Arjan van de Ven <arjan@...ux.intel.com>
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

On Sun, 11 Oct 2009, Arjan van de Ven wrote:
> 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.

That *still* means we need the patch in this thread.

-- 
  "One disk to rule them all, One disk to find them. One disk to bring
  them all and in the darkness grind them. In the Land of Redmond
  where the shadows lie." -- The Silicon Valley Tarot
  Henrique Holschuh
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