linux-kernel - Re: sched: tweak select_idle_sibling to look for idle threads

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Message-ID: <20160502145817.GW3408@twins.programming.kicks-ass.net>
Date:	Mon, 2 May 2016 16:58:17 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Mike Galbraith <mgalbraith@...e.de>
Cc:	Chris Mason <clm@...com>, Ingo Molnar <mingo@...nel.org>,
	Matt Fleming <matt@...eblueprint.co.uk>,
	linux-kernel@...r.kernel.org
Subject: Re: sched: tweak select_idle_sibling to look for idle threads

On Mon, May 02, 2016 at 04:50:04PM +0200, Mike Galbraith wrote:
> Oh btw, did you know single socket boxen have no sd_busy?  That doesn't
> look right.

I suspected; didn't bother looking at yet. The 'problem' is that the LLC
domain is the top-most, so it doesn't have a parent domain. I'm sure we
can come up with something if we can get this all working right.

And yes, I can get gains on various workloads with various options, I
can even break all workloads, but I've so far completely failed on
getting a win for everyone :/

In particular low count sysbench-psql (oltp test) vs tbench
client==nr_cores is having me flummoxed for a bit.