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From: Nikos Chantziaras <realnc@arcor.de>
Subject: [gentoo-user] Re: pf-sources Kernel
Date: Wed, 25 May 2011 16:15:37 +0300
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On 05/25/2011 03:12 PM, Alex Schuster wrote:
> [...] Now I have 8G, and
> do not notice that much swapping any more. Although... right now,  swap is
> at 600M, and the system is swapping right now. Weird. I'm running rdiff-
> backup, this seems to increase swap size. Maybe too much of the stuff it
> precesses is being cached? Swap is at 800M now.

You can tweak this in /etc/sysctl.conf:

   vm.swappiness = 30

Or maybe 20.  The default is 60.  IMO way too high for desktop systems.