Messages in this thread | | | Subject | Re: sched: Avoid SMT siblings in select_idle_sibling() if possible | From | Mike Galbraith <> | Date | Tue, 27 Mar 2012 15:56:38 +0200 |
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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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