Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1750707AbWLMU0T (ORCPT ); Wed, 13 Dec 2006 15:26:19 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1750730AbWLMU0T (ORCPT ); Wed, 13 Dec 2006 15:26:19 -0500 Received: from smtp2.belwue.de ([129.143.2.15]:41808 "EHLO smtp2.belwue.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750707AbWLMU0S (ORCPT ); Wed, 13 Dec 2006 15:26:18 -0500 X-Greylist: delayed 1529 seconds by postgrey-1.27 at vger.kernel.org; Wed, 13 Dec 2006 15:26:18 EST Date: Wed, 13 Dec 2006 20:59:55 +0100 (CET) From: Karsten Weiss To: Erik Andersen Cc: Christoph Anton Mitterer , linux-kernel@vger.kernel.org, Chris Wedgwood Subject: Re: data corruption with nvidia chipsets and IDE/SATA drives // memory hole mapping related bug?! In-Reply-To: <20061213195305.GA3358@codepoet.org> Message-ID: References: <20061213195305.GA3358@codepoet.org> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1508 Lines: 37 On Wed, 13 Dec 2006, Erik Andersen wrote: > On Mon Dec 11, 2006 at 10:24:02AM +0100, Karsten Weiss wrote: > > Last week we did some more testing with the following result: > > > > We could not reproduce the data corruption anymore if we boot the machines > > with the kernel parameter "iommu=soft" i.e. if we use software bounce > > buffering instead of the hw-iommu. (As mentioned before, booting with > > mem=2g works fine, too, because this disables the iommu altogether.) > > > > I.e. on these systems the data corruption only happens if the hw-iommu > > (PCI-GART) of the Opteron CPUs is in use. > > > > Christoph, Erik, Chris: I would appreciate if you would test and hopefully > > confirm this workaround, too. > > What did you set the BIOS to when testing this setting? > Memory Hole enabled? IOMMU enabled? "Memory hole mapping" was set to "hardware". With "disabled" we only see 3 of our 4 GB memory. Best regards, Karsten -- __________________________________________creating IT solutions Dipl.-Inf. Karsten Weiss science + computing ag phone: +49 7071 9457 452 Hagellocher Weg 73 teamline: +49 7071 9457 681 72070 Tuebingen, Germany email: knweiss@science-computing.de www.science-computing.de - 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/