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From: Andi Kleen <ak@suse.de>
To: Christoph Lameter <clameter@sgi.com>
Subject: Re: [RFC 0/8] Reduce MAX_NR_ZONES and remove useless zones.
Date: Tue, 4 Jul 2006 17:23:46 +0200
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Cc: Christoph Hellwig <hch@infradead.org>, linux-kernel@vger.kernel.org,
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> I guess then we should drop ZONE_DMA (its a misnoner anyways since it 
> seems to indicate that DMA is only possible in this zone). Instead use
> 
> ZONE_ISA_DMA		-> ISA DMA Area (16 MB boundary)
> ZONE_32BIT_DMA		-> 32bit DMA area (well 900 MB on x86_64 but somewhere in that area)

It's 4GB on x86-64.

The 900MB refered to the boundary between NORMAL and HIGHMEM on i386.

-Andi