Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757037Ab1DNGK3 (ORCPT ); Thu, 14 Apr 2011 02:10:29 -0400 Received: from terminus.zytor.com ([198.137.202.10]:39188 "EHLO mail.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756574Ab1DNGK2 (ORCPT ); Thu, 14 Apr 2011 02:10:28 -0400 Message-ID: <4DA68FBB.4030807@zytor.com> Date: Wed, 13 Apr 2011 23:10:03 -0700 From: "H. Peter Anvin" User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.15) Gecko/20110403 Fedora/3.1.9-6.fc15 Thunderbird/3.1.9 MIME-Version: 1.0 To: Dave Airlie CC: Yinghai Lu , Linux Kernel Mailing List , dri-devel@lists.freedesktop.org, Tejun Heo , Linus Torvalds , Thomas Gleixner Subject: Re: Linux 2.6.39-rc3 References: <20110412090207.GE19819@8bytes.org> <20110412184433.GF19819@8bytes.org> <20110413064609.GA18777@elte.hu> <20110413172147.GI19819@8bytes.org> <4DA5F62F.3030504@kernel.org> <4DA654D6.2060103@zytor.com> <1302746853.4842.20.camel@clockmaker-el6> In-Reply-To: <1302746853.4842.20.camel@clockmaker-el6> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1099 Lines: 30 On 04/13/2011 07:07 PM, Dave Airlie wrote: >> >> Okay, staring at this, it definitely seems toxic to overlay the GART >> over memory areas reserved by the BIOS. If I were to guess, I would say >> that the problem here seems to be that the kernel thinks it is >> overlaying 64 MiB of memory, but the actual GART is in fact 512 MiB in >> size -- 131072 CPU pages -- which now overlaps the BIOS reserved areas. >> >> Alex D., could you comment on the "num cpu pages" bit? > > These are not CPU addresses. I think we've stated that already. Not the > droids. > > the num cpu pages is how many CPU pages would be needed to fill the GPU > GTT, for those crazy cases where CPU pagesize != GPU pagesize. > OK, well, something is still weird. -hpa -- H. Peter Anvin, Intel Open Source Technology Center I work for Intel. I don't speak on their behalf. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/