From mboxrd@z Thu Jan 1 00:00:00 1970 From: Henrique de Moraes Holschuh Subject: Re: MTRR use in drivers Date: Sun, 23 Jun 2013 16:29:36 -0300 Message-ID: <20130623192936.GA28655@khazad-dum.debian.net> References: <51C3DDFA.7050204@zytor.com> <51C69732.1010906@gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: Sender: linux-kernel-owner@vger.kernel.org To: "H. Peter Anvin" Cc: Brice Goglin , Linux Kernel Mailing List , David Airlie , dri-devel@lists.freedesktop.org List-Id: dri-devel@lists.freedesktop.org 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