linux-kernel - Re: kswapd high CPU usage with no swap

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Date:	Tue, 25 Sep 2007 12:13:41 +0200
From:	Jan Kundrát <jkt@...too.org>
To:	Rik van Riel <riel@...hat.com>
CC:	linux-kernel@...r.kernel.org
Subject: Re: kswapd high CPU usage with no swap

Rik van Riel wrote:
> How much memory did you have in "cached" when you looked
> with top (and no swap enabled) ?

Hi Rik,
it was pretty low number (several thousands, or maybe tens of thousands).

In the meanwhile, I've come across your patch [1] ("prevent kswapd from
freeing excessive amounts of lowmem") and applied it locally. I'll see
if it fixes my problem, but at a first glance, it seems that it might
actually slow other things down -- when I switch windows, konqueror's
screen redrawing seems to be pretty slow and I can see it progressing
from top to bottom...

[1] http://lkml.org/lkml/2007/9/5/289

Cheers,
-jkt

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