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

[Srivatsa Vaddagiri]

* Mike Galbraith <efault@xxxxxx> [2012-02-20 19:25:43]:

> > I can give that a try for my benchmark and see how much it helps. My
> > suspicion is it will not fully solve the problem I have on hand.
> 
> I doubt it will either.  Your problem is when it doesn't succeed, but
> you have an idle core available in another domain.

fwiw the patch I had sent does a wakeup balance within prev_cpu's
cache_domain (and not outside). It handles the case where we don't have
any idle cpu/core within prev_cpu's cache domain, in which case we look
for next best thing (least loaded cpu). I did see good numbers with that
(for both my benchmark and sysbench).

More on this later in the day ..

- vatsa

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