Date: Sat, 17 Apr 2004 14:33:33 -0700
From: William Lee Irwin III <wli@holomorphy.com>
To: Marc Singer <elf@buici.com>
Cc: linux-kernel@vger.kernel.org, akpm@osdl.org
Subject: Re: vmscan.c heuristic adjustment for smaller systems
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	Marc Singer <elf@buici.com>, linux-kernel@vger.kernel.org,
	akpm@osdl.org
References: <20040417193855.GP743@holomorphy.com> <20040417212958.GA8722@flea>
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On Sat, Apr 17, 2004 at 12:38:55PM -0700, William Lee Irwin III wrote:
>> Marc Singer reported an issue where an embedded ARM system performed
>> poorly due to page replacement potentially prematurely replacing
>> mapped memory where there was very little mapped pagecache in use to
>> begin with.
>> Marc Singer has results where this is an improvement, and hopefully can
>> clarify as-needed. Help determining whether this policy change is an
>> improvement for a broader variety of systems would be appreciated.

On Sat, Apr 17, 2004 at 02:29:58PM -0700, Marc Singer wrote:
> I have some numbers to clarify the 'improvement'.
> Setup:
>   ARM922 CPU, 200MHz, 32MiB RAM
>   NFS mounted rootfs, tcp, hard, v3, 4K blocks
>   Test application copies 41MiB file and prints the elapsed time
> The two scenarios differ only in the setting of /proc/sys/vm/swappiness.

This doesn't match your first response. Anyway, this one is gets
scrapped. I guess if swappiness solves it, then so much the better.


-- wli
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