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    SubjectRe: sched: Avoid SMT siblings in select_idle_sibling() if possible
    * Ingo Molnar <mingo@elte.hu> [2012-02-23 12:19:29]:

    > sysbench is one of the best ones punishing bad scheduler
    > balancing mistakes.

    Here are the sysbench oltp score on same machine i.e:

    Machine : 2 Quad-core Intel X5570 CPU (H/T enabled)
    Kernel : tip (HEAD at 6241cc8)
    sysbench : 0.4.12

    sysbench was run with 16 threads as:

    ./sysbench --num-threads=16 --max-requests=100000 --test=oltp --oltp-table-size=500000 --mysql-socket=/var/lib/mysql/mysql.sock --oltp-read-only --mysql-user=root --mysql-password=blah run

    sysbench was run 5 times with fs-cache being purged before each run
    (echo 3 > /proc/sys/vm/drop_caches).

    Average of 5 runs alongwith % std. dev. is noted for various OLTP stats

    SD_BALANCE_WAKE SD_BALANCE_WAKE
    disabled enabled

    transactions (per sec) 4833.826 (+- 0.75%) 4837.354 (+- 1%)
    read/write requests (per sec) 67673.580 (+- 0.75%) 67722.960 (+- 1%)
    other ops (per sec) 9667.654 (+- 0.75%) 9674.710 (+- 1%)

    There is minor improvement seen when SD_BALANCE_WAKE is enabled at SMT/MC
    domains, but no degradation observed with it enabled.

    - vatsa



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