amd64 iommu causing corruption? (was 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: > 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

amd64 iommu causing corruption? (was 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: 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