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    SubjectRe: [RFC PATCH] sched/numa: do load balance between remote nodes

    On 06-06-2012 10:52, Alex Shi wrote:

    > commit cb83b629b

    Please also specify that commit's summary in parens.

    > remove the NODE sched domain and check if the node
    > distance in SLIT table is farther than REMOTE_DISTANCE, if so, it will
    > lose the load balance chance at exec/fork/wake_affine points.

    > But actually, even the node distance is farther than REMOTE_DISTANCE,
    > Modern CPUs also has QPI like connections, that make memory access is

    "Is" not needed here.

    > not too slow between nodes. So above losing on NUMA machine make a
    > huge performance regression on benchmark: hackbench, tbench, netperf
    > and oltp etc.

    > This patch will recover the scheduler behavior to old mode on all my
    > Intel platforms: NHM EP/EX, WSM EP, SNB EP/EP4S, and so remove the
    > perfromance regressions. (all of them just has 2 kinds distance, 10 21)

    > Signed-off-by: Alex Shi<>

    WBR, Sergei

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      Last update: 2012-06-06 13:21    [W:0.023 / U:0.076 seconds]
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