Message-ID: <20021227131313.29241.qmail@linuxmail.org>
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From: "Paolo Ciarrocchi" <ciarrocchi@linuxmail.org>
To: conman@kolivas.net, linux-kernel@vger.kernel.org
Cc: ciarrocchi@linuxmail.org, akpm@digeo.com
Date: Fri, 27 Dec 2002 21:13:13 +0800
Subject: Re: [BENCHMARK] vm swappiness with contest
Sender: linux-kernel-owner@vger.kernel.org
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From: Con Kolivas <conman@kolivas.net>
[...]
> Paolo if I was to choose a number from these values I'd suggest lower than 60 
> rather than higher, BUT that is because the io load effects become a real 
> problem when the kernel is swappy - don't _really_ know what this means for 
> the rest of the time. Maybe in the 40-50 range. There seems to be a knee 
> (bend) in the curve (most noticable in dbench_load) rather than the curves 
> being linear. That knee I believe simply shows the way the algorithm for 
> swappiness basically works. I might throw a 50 at the machine as well to see 
> what that does.

Con, thank you for your time and results.
I have to confirm you that large file writes with a swappy kernel 
seems to waste time swapping data, I see it with the resp tool too.

May be we can say that a good value for a desktop enviroment is in the
40-50 range while for a server is 70-80, this because with the osdb bench
tool I get the best results with 80.

Ciao,
        Paolo 
-- 
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