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    SubjectRe: Free memory never fully used, swapping
    On Mon, Nov 22, 2010 at 03:44:19PM -0800, Andrew Morton wrote:
    > On Mon, 15 Nov 2010 11:52:46 -0800
    > Simon Kirby <> wrote:
    > > I noticed that CONFIG_NUMA seems to enable some more complicated
    > > reclaiming bits and figured it might help since most stock kernels seem
    > > to ship with it now. This seems to have helped, but it may just be
    > > wishful thinking. We still see this happening, though maybe to a lesser
    > > degree. (The following observations are with CONFIG_NUMA enabled.)
    > >


    As this is a NUMA machine, what is the value of
    /proc/sys/vm/zone_reclaim_mode ? When enabled, this reclaims memory
    local to the node in preference to using remote nodes. For certain
    workloads this performs better but for users that expect all of memory
    to be used, it has surprising results.

    If set to 1, try testing with it set to 0 and see if it makes a
    difference. Thanks

    Mel Gorman
    Part-time Phd Student Linux Technology Center
    University of Limerick IBM Dublin Software Lab

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