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/
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