linux-kernel - Re: [PATCH RESEND] sched: prefer an idle cpu vs an idle sibling for BALANCE

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Message-ID: <1432815303.3237.156.camel@novell.com>
Date:	Thu, 28 May 2015 14:15:03 +0200
From:	Mike Galbraith <mgalbraith@...ell.com>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	Peter Zijlstra <peterz@...radead.org>, Josef Bacik <jbacik@...com>,
	riel@...hat.com, mingo@...hat.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH RESEND] sched: prefer an idle cpu vs an idle sibling for
 BALANCE_WAKE

On Thu, 2015-05-28 at 13:49 +0200, Ingo Molnar wrote:
> * Mike Galbraith <mgalbraith@...ell.com> wrote:
> 
> > On Thu, 2015-05-28 at 12:21 +0200, Peter Zijlstra wrote:
> > 
> > > In fact, select_idle_sibling() is already too expensive on current
> > > server hardware (far too damn many cpus in a LLC domain).
> > 
> > Yup.  I've played with rate limiting motion per task because of that.
> > Packages have gotten way too damn big.
> 
> What's the biggest you've seen?

15 cores so far.  It'll no doubt grow.

	-Mike

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