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    SubjectRe: sched: Avoid SMT siblings in select_idle_sibling() if possible
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    On Mon, 2012-02-20 at 20:07 +0100, Peter Zijlstra wrote: 
    > On Mon, 2012-02-20 at 19:14 +0100, Mike Galbraith wrote:
    > > Enabling SD_BALANCE_WAKE used to be decidedly too expensive to consider.
    > > Maybe that has changed, but I doubt it.
    >
    > Right, I through I remembered some such, you could see it on wakeup
    > heavy things like pipe-bench and that java msg passing thing, right?

    Yeah, it beat up switch heavy buddies pretty bad.

    -Mike




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