linux-kernel - Re: -mm merge plans for 2.6.23

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Message-ID: <46A93C2B.4080902@kite.se>
Date:	Fri, 27 Jul 2007 02:28:27 +0200
From:	Magnus Naeslund <mag@...e.se>
To:	Al Boldi <a1426z@...ab.com>
CC:	Ray Lee <ray-lk@...rabbit.org>, "david@...g.hm" <david@...g.hm>,
	Nick Piggin <nickpiggin@...oo.com.au>,
	Jesper Juhl <jesper.juhl@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	ck list <ck@....kolivas.org>, Ingo Molnar <mingo@...e.hu>,
	Paul Jackson <pj@....com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: -mm merge plans for 2.6.23

Al Boldi wrote:
> 
> Thanks for asking.  I'm rather surprised why nobody's noticing any of this 
> slowdown.  To be fair, it's not really a regression, on the contrary, 2.4 is 
> lot worse wrt swapin and swapout, and Rik van Riel even considers a 50% 
> swapin slowdown wrt swapout something like better than expected (see thread 
> '[RFC] kswapd: Kernel Swapper performance').  He probably meant random 
> swapin, which seems to offer a 4x slowdown.
> 

Sorry for the late reply.
Well I think I reported this or another swap/tmpfs performance issue earlier ( http://marc.info/?t=116542915700004&r=1&w=2 ), we got the suggestion to increase /proc/sys/vm/page-cluster to 5, but we never came around to try it.
Maybe this was the reason for my report to be almost entirely ignored, sorry for that.

Regards,
Magnus
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