Linux doesn't seem to particularly like a second swap area

From: David Tonhofer, m-plify S.A. (d.tonhofer_at_m-plify.com)
Date: 11/17/05

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    Date: Thu, 17 Nov 2005 16:09:10 +0100
To: redhat-list@redhat.com

    Hello,

    I have two swap areas ("man swapon") of equal size on the same disk:

    $ cat /proc/swaps
    Filename Type Size Used Priority
    /dev/mapper/VolGroup00-LogVol01 partition 3145720 3047372 -1 = "higher"
    /dev/mapper/VolGroup00-LogVol00 partition 3145720 122880 -2 = "lower"

    Linux (RHES 2.6.9-11.ELsmp) likes to fill up the high-priority swap
    area but holds back on filling up the second swap area, actually
    it looks like it positively tries to keep it empty!

    Here's a little graph, showing that swap usage is flat and
    suspiciously close to the size of one swap area:
    <http://yui.m-plify.net/SwapGraph.gif>

    I expected Linux to fill the first swap area and use the second one
    if so needed.

    Any pointers or comments?

    Best

    -- David 

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