linux-kernel - Re: load balancing regression since commit 367456c7

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Message-ID: <1334942012.3796.50.camel@schen9-DESK>
Date:	Fri, 20 Apr 2012 10:13:32 -0700
From:	Tim Chen <tim.c.chen@...ux.intel.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Suresh Siddha <suresh.b.siddha@...el.com>,
	Alex Shi <alex.shi@...el.com>, Ying <ying.huang@...el.com>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: load balancing regression since commit 367456c7

On Fri, 2012-04-20 at 18:53 +0200, Peter Zijlstra wrote:
> On Fri, 2012-04-20 at 09:40 -0700, Tim Chen wrote:
> > We also do not see regression for hackbench on WSM-EP, but only 
> > on machines with Sandy-Bridge EP (2 socket, 8 cores/socket, HT enabled).  
> 
> Argh, Suresh, any idea what could be different and relevant to this
> issue between WSM and SNB -EP ?
> 
> Tim, can you see the problem on the desktop SNB part? That's the only
> SNB I have available.
> 
> > We are not running hackbench in cgroup for this test.
> > 
> > The Sandy Bridge EP machines installed has FC16, so I think it uses 
> > systemd. The machine on our WSM EP has FC15, which also has systemd.
> 
> Ah, but your .config has:
> 
> CONFIG_CGROUP_SCHED=y
> CONFIG_SCHED_AUTOGROUP=y
> 
> and systemd, when cpu-cgroup is available, will automagically use it.
> 
> Could you disable those two CONFIG knobs and see if it persists?
> 

Turning those off did recover the regression.

Tim

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