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    SubjectRe: [PATCH 1/3] Zone reclaim V3: main patch
    On Thu, 8 Dec 2005, Andi Kleen wrote:

    > Sorry I made a mistake here earlier. On checking the ACPI spec
    > again it's valid to have distances < 20 (e.g. for a 1.5 NUMA factor
    > it would be legally 15)

    Saw that too.

    > So better just check > LOCAL_DISTANCE, not >= 20.

    For Altix 20 means that the other node is remote but in the same
    enclosure / motherboard. Latency is very low in these cases. I think in
    these small configurations it is better to go off node rather than using
    the reclaim logic.

    Other small configurations may have the same issues.

    RECLAIM_DISTANCE can be set per arch if the default is not okay.

    > Also a lot of Opteron BIOS get that wrong, but I'm adding some
    > sanity checking now so it should work in future.

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      Last update: 2005-12-08 22:26    [W:0.019 / U:15.280 seconds]
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