linux-kernel - Re: [PATCH -mm 00/15] VM pageout scalability improvements (V6)

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Date:	Mon, 28 Apr 2008 15:55:00 -0400
From:	Rik van Riel <riel@...hat.com>
To:	linux-kernel@...r.kernel.org
Cc:	lee.schermerhorn@...com, akpm@...ux-foundation.org,
	kosaki.motohiro@...fujitsu.com
Subject: Re: [PATCH -mm 00/15] VM pageout scalability improvements (V6)

On Mon, 28 Apr 2008 14:18:35 -0400
Rik van Riel <riel@...hat.com> wrote:

> This patch series improves VM scalability 

Here is some (absolutely minimal) performance data.

Running "fillmem 16000" on my 16 GB test system puts the system about 800MB
into swap.  Both run time and CPU use are improved with this patch series.
The numbers are an average of about a dozen runs.

2.6.25-mm1:
real	1m31
user	0m11
sys	0m32

2.5.25-mm1-splitvm:
real	1m02
user	0m11
sys	0m22

This does not account for kswapd CPU use, which accumulated to about 56
seconds total in the splitvm kernel, but around 5 minutes on 2.6.25-mm1.

I will make a kernel RPM with the split LRU patch set available so other
people can easily do performance tests.

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