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    SubjectRe: sched: Avoid SMT siblings in select_idle_sibling() if possible

    * Srivatsa Vaddagiri <vatsa@linux.vnet.ibm.com> wrote:

    > * Ingo Molnar <mingo@elte.hu> [2012-02-23 12:26:50]:
    >
    > > pro perf tip of the day: did you know that it's possible to run:
    > >
    > > perf stat --repeat 10 --null perf bench sched pipe
    >
    > Ah yes ..had forgotten that! What is the recommended # of
    > iterations to run?

    Well, I start at 3 or 5 and sometimes increase it to get a
    meaningful stddev - i.e. one that is smaller than half of the
    measured effect. (for cases where I expect an improvement and
    want to measure it.)

    Thanks,

    Ingo


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