Messages in this thread | | | Subject | Re: ZONE_DMA (was: Re: 2.6.19 -mm merge plans) | From | James Bottomley <> | Date | Thu, 21 Sep 2006 11:59:51 -0400 |
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On Thu, 2006-09-21 at 02:03 +0100, Alan Cox wrote: > IOMMUs don't always help. They IOMMU aperture on AMD64 for example is > too high to help devices with below 32bit limits.
That's because it's not an IOMMU; it's a GART. A true IOMMU separates the machine physical and bus physical address spaces ... a GART merely remaps a hole in physical address space.
James
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