linux-kernel - Re: x86_64: Make sparsemem/vmemmap the default memory model

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Message-ID: <Pine.LNX.4.64.0711122040380.30724@schroedinger.engr.sgi.com>
Date:	Mon, 12 Nov 2007 20:41:10 -0800 (PST)
From:	Christoph Lameter <clameter@....com>
To:	Ray Lee <ray-lk@...rabbit.org>
cc:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, Mel Gorman <mel@....ul.ie>,
	Andi Kleen <ak@...e.de>, Andy Whitcroft <apw@...dowen.org>
Subject: Re: x86_64: Make sparsemem/vmemmap the default memory model

On Mon, 12 Nov 2007, Ray Lee wrote:

> Discontig obviously needs to die. However, FlatMem is consistently
> faster, averaging about 2.1% better overall for your numbers above. Is
> the page allocator not, erm, a fast path, where that matters?
> 
> Order	Flat	Sparse	% diff
> 0	639	641	0.3

IMHO Order 0 currently matters most and the difference is negligible 
there.

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