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    Subject[PATCH 3/8] sched: weaken sync hint
    From: Mike Galbraith <efault@gmx.de>

    Mysql+oltp and pgsql+oltp peaks are still shifted right. The below puts
    the peaks back to 1 client/server pair per core.

    Use the avg_overlap information to weaken the sync hint.

    Signed-off-by: Mike Galbraith <efault@gmx.de>
    Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
    ---
    kernel/sched_fair.c | 7 +++----
    1 file changed, 3 insertions(+), 4 deletions(-)

    Index: linux-2.6/kernel/sched_fair.c
    ===================================================================
    --- linux-2.6.orig/kernel/sched_fair.c
    +++ linux-2.6/kernel/sched_fair.c
    @@ -1228,10 +1228,9 @@ wake_affine(struct sched_domain *this_sd
    if (!(this_sd->flags & SD_WAKE_AFFINE) || !sched_feat(AFFINE_WAKEUPS))
    return 0;

    - if (!sync && sched_feat(SYNC_WAKEUPS) &&
    - curr->se.avg_overlap < sysctl_sched_migration_cost &&
    - p->se.avg_overlap < sysctl_sched_migration_cost)
    - sync = 1;
    + if (sync && (curr->se.avg_overlap > sysctl_sched_migration_cost ||
    + p->se.avg_overlap > sysctl_sched_migration_cost))
    + sync = 0;

    /*
    * If sync wakeup then subtract the (maximum possible)
    --



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