linux-kernel - Re: [rfc] increase struct page size?!

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Message-ID: <Pine.LNX.4.64.0705211004340.26282@schroedinger.engr.sgi.com>
Date:	Mon, 21 May 2007 10:06:39 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Nick Piggin <npiggin@...e.de>
cc:	William Lee Irwin III <wli@...omorphy.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux Memory Management List <linux-mm@...ck.org>,
	linux-arch@...r.kernel.org
Subject: Re: [rfc] increase struct page size?!

On Sun, 20 May 2007, Nick Piggin wrote:

> I _am_ considering the average case, and I consider the aligned structure
> is likely to win on average :) I just don't have numbers for it yet.

I'd be glad too if you could get some numbers. I did some benchmarking a 
few weeks ago on x86_64 and I found only a very minimal performance drop 
if the calculation was simplified. 

Note also that a smaller structure means that more page structs can be 
covered by a certain amount of cachelines. Doing the alignment may cause 
more cacheline misses.

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