linux-kernel - Re: ZONE_DMA (was: Re: 2.6.19 -mm merge plans)

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Date:	Thu, 21 Sep 2006 11:59:51 -0400
From:	James Bottomley <James.Bottomley@...elEye.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	Christoph Lameter <clameter@....com>,
	Andrew Morton <akpm@...l.org>,
	"Martin J. Bligh" <mbligh@...igh.org>,
	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
	Christoph Hellwig <hch@...radead.org>
Subject: Re: ZONE_DMA (was: Re: 2.6.19 -mm merge plans)

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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