From: Tim Chen <tim.c.chen@linux.intel.com>
To: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Suresh Siddha <suresh.b.siddha@intel.com>,
Alex Shi <alex.shi@intel.com>, Ying <ying.huang@intel.com>,
linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: load balancing regression since commit 367456c7
Date: Fri, 20 Apr 2012 10:13:32 -0700 [thread overview]
Message-ID: <1334942012.3796.50.camel@schen9-DESK> (raw)
In-Reply-To: <1334940837.2463.70.camel@laptop>
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
next prev parent reply other threads:[~2012-04-20 17:13 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-04-11 1:06 load balancing regression since commit 367456c7 Tim Chen
2012-04-17 11:43 ` Peter Zijlstra
2012-04-17 12:09 ` Peter Zijlstra
2012-04-17 16:44 ` Tim Chen
2012-04-20 14:00 ` Peter Zijlstra
2012-04-20 16:40 ` Tim Chen
2012-04-20 16:53 ` Peter Zijlstra
2012-04-20 17:13 ` Tim Chen [this message]
2012-04-20 17:33 ` Peter Zijlstra
2012-04-25 14:56 ` Peter Zijlstra
2012-04-25 17:38 ` Tim Chen
2012-04-25 17:43 ` Peter Zijlstra
2012-04-25 17:58 ` Tim Chen
2012-04-26 11:56 ` [tip:sched/urgent] sched: Fix more load-balancing fallout tip-bot for Peter Zijlstra
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