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

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Message-Id: <1158800630.11109.72.camel@localhost.localdomain>
Date:	Thu, 21 Sep 2006 02:03:50 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Christoph Lameter <clameter@....com>
Cc:	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)

Ar Mer, 2006-09-20 am 17:31 -0700, ysgrifennodd Christoph Lameter:
> ZONE_DMA does not have a bright future with IOMMUs and other things 
> around. None of my system uses ZONE_DMA and I have a variety of them.

IOMMUs don't always help. They IOMMU aperture on AMD64 for example is
too high to help devices with below 32bit limits.

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