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Message-ID: <20061213195305.GA3358@codepoet.org> Date: Wed, 13 Dec 2006 12:53:05 -0700 From: Erik Andersen <andersen@...epoet.org> To: Karsten Weiss <K.Weiss@...ence-computing.de> Cc: Christoph Anton Mitterer <calestyo@...entia.net>, linux-kernel@...r.kernel.org, Chris Wedgwood <cw@...f.org> Subject: Re: data corruption with nvidia chipsets and IDE/SATA drives // memory hole mapping related bug?! 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? -Erik -- Erik B. Andersen http://codepoet-consulting.com/ --This message was written using 73% post-consumer electrons-- - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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