linux-kernel - Re: The performance and behaviour of the anti-fragmentation related patches

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Message-ID: <Pine.LNX.4.64.0703012031410.14299@schroedinger.engr.sgi.com>
Date:	Thu, 1 Mar 2007 20:33:04 -0800 (PST)
From:	Christoph Lameter <clameter@...r.sgi.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
cc:	Nick Piggin <npiggin@...e.de>, Mel Gorman <mel@...net.ie>,
	mingo@...e.hu, jschopp@...tin.ibm.com, arjan@...radead.org,
	torvalds@...ux-foundation.org, mbligh@...igh.org,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: The performance and behaviour of the anti-fragmentation related
 patches

On Thu, 1 Mar 2007, Andrew Morton wrote:

> Sorry, but this is crap.  zones and nodes are distinct, physical concepts
> and you're kidding yourself if you think you can somehow fudge things to make
> one of them just go away.
> 
> Think: ZONE_DMA32 on an Opteron machine.  I don't think there is a sane way
> in which we can fudge away the distinction between
> bus-addresses-which-have-the-32-upper-bits-zero and
> memory-which-is-local-to-each-socket.

Of course you can. Add a virtual DMA and DMA32 zone/node and extract the 
relevant memory from the base zone/node.

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