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    SubjectRe: sched: Avoid SMT siblings in select_idle_sibling() if possible
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    On Mon, 2012-03-26 at 20:06 +0200, Peter Zijlstra wrote:

    > The biggest regression came from tbench, wasn't that mostly a random
    > number generator anyway?

    That's dbench ;-) Tbench does wiggle around more than you'd like
    though. I've never tracked, but in lots of running the thing, 2-3% you
    can forget chasing, and I once bisected a 5% regression to an unrelated
    change, reverted and re-applied the suspect a few times in disbelief,
    and it tracked. You can't trust it _too_ much. I consider it a
    reliable indicator that I'd better do more testing. If others agree,
    it's a real regression, if not, it's those damn Elves 'n Gremlins ;-)

    -Mike




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