linux-kernel - Re: [Intel IOMMU][patch 8/8] Preserve some Virtual Address when devices cannot address entire range.

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Date:	Wed, 25 Apr 2007 08:55:48 +0200
From:	Andi Kleen <ak@...e.de>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	David Miller <davem@...emloft.net>, ashok.raj@...el.com,
	linux-kernel@...r.kernel.org, akpm@...l.org, gregkh@...e.de,
	muli@...ibm.com, asit.k.mallick@...el.com,
	suresh.b.siddha@...el.com, anil.s.keshavamurthy@...el.com,
	arjan@...ux.intel.com, shaohua.li@...el.com
Subject: Re: [Intel IOMMU][patch 8/8] Preserve some Virtual Address when devices cannot address entire range.

On Wednesday 25 April 2007 03:12:51 H. Peter Anvin wrote:

> You can probably find almost any possible bitmask if you look long 
> enough.  Hardware vendors are notorious for this kind of "optimizations".

The nice thing is if this was solved in the IOMMU code then we could drop
(or not initialize) GFP_DMA on systems with that hardware. I guess GFP_DMA32 
would still need to stay for the graphics devices though.

Not sure how much difference it would make though, but at least Christoph Lameter
seems to think it would.

-Andi
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