linux-kernel - Re: MTRR use in drivers

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Message-ID: <20130623192936.GA28655@khazad-dum.debian.net>
Date:	Sun, 23 Jun 2013 16:29:36 -0300
From:	Henrique de Moraes Holschuh <hmh@....eng.br>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Brice Goglin <brice.goglin@...il.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	David Airlie <airlied@...ux.ie>,
	dri-devel@...ts.freedesktop.org
Subject: Re: MTRR use in drivers

On Sun, 23 Jun 2013, H. Peter Anvin wrote:
> Why do you care about performance when PAT is disabled?

It will regress already slow boxes.  We blacklist a LOT of P4s, PMs, etc and
nobody ever took the pain to track down which ones of those actually have
PAT+MTRR aliasing bugs.

These boxes have boards like the Radeon X300, which needs either PAT or MTRR
to not become unusable...

-- 
  "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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