Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754440Ab1DONRK (ORCPT ); Fri, 15 Apr 2011 09:17:10 -0400 Received: from mx3.mail.elte.hu ([157.181.1.138]:33267 "EHLO mx3.mail.elte.hu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753579Ab1DONRI (ORCPT ); Fri, 15 Apr 2011 09:17:08 -0400 Date: Fri, 15 Apr 2011 15:16:50 +0200 From: Ingo Molnar To: Joerg Roedel Cc: Linus Torvalds , "H. Peter Anvin" , Yinghai Lu , Alex Deucher , Linux Kernel Mailing List , "dri-devel@lists.freedesktop.org" , Thomas Gleixner , Tejun Heo , alexandre.f.demers@gmail.com Subject: Re: Linux 2.6.39-rc3 Message-ID: <20110415131650.GB18660@elte.hu> References: <4DA5F62F.3030504@kernel.org> <20110413193459.GL19819@8bytes.org> <4DA60C30.4060606@kernel.org> <4DA6145D.9070703@kernel.org> <4DA655E7.3000904@zytor.com> <20110415131152.GJ18463@8bytes.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20110415131152.GJ18463@8bytes.org> User-Agent: Mutt/1.5.20 (2009-08-17) X-ELTE-SpamScore: -2.0 X-ELTE-SpamLevel: X-ELTE-SpamCheck: no X-ELTE-SpamVersion: ELTE 2.0 X-ELTE-SpamCheck-Details: score=-2.0 required=5.9 tests=BAYES_00 autolearn=no SpamAssassin version=3.3.1 -2.0 BAYES_00 BODY: Bayes spam probability is 0 to 1% [score: 0.0000] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1352 Lines: 35 * Joerg Roedel wrote: > On Wed, Apr 13, 2011 at 07:33:40PM -0700, Linus Torvalds wrote: > > we definitely want to also understand the reason for things not > > working, even if we do revert.. > > Okay, here it is. > > After experimenting with different configurations for the north-bridge > it turned out that a GART related MCE fires at the time the machine > reboots. BIOSes configure the machine to sync-flood in that case which > causes a reboot. > > After decoding the MCE it turned out to be a GART TBL Wlk Error. Such > errors can happen if devices (speculativly) access GART ranges mapped > invalid. The AMD BKDG for Fam10h CPUs recommends to disable these errors > at all. But unfortunatly some BIOSes (including the one on my laptop) > forget to do this. > > Below is a patch which disables these errors if the BIOS didn't do it. > It fixes the problem on my site. Ok, but how did the allocation changes start triggering this error in v2.6.39-rc1? There must still be some layout specific thing here, right? Do we understand the details of that as well? Thanks, Ingo -- 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/