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

[Mike Galbraith]

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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