From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757036Ab2DTQyG (ORCPT ); Fri, 20 Apr 2012 12:54:06 -0400 Received: from casper.infradead.org ([85.118.1.10]:49997 "EHLO casper.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754564Ab2DTQyC (ORCPT ); Fri, 20 Apr 2012 12:54:02 -0400 Subject: Re: load balancing regression since commit 367456c7 From: Peter Zijlstra To: Tim Chen Cc: Suresh Siddha , Alex Shi , Ying , linux-kernel In-Reply-To: <1334940042.3796.48.camel@schen9-DESK> References: <1334106376.19157.89.camel@schen9-DESK> <1334664553.28150.87.camel@twins> <1334681054.3796.28.camel@schen9-DESK> <1334930421.2463.60.camel@laptop> <1334940042.3796.48.camel@schen9-DESK> Content-Type: text/plain; charset="UTF-8" Date: Fri, 20 Apr 2012 18:53:57 +0200 Message-ID: <1334940837.2463.70.camel@laptop> Mime-Version: 1.0 X-Mailer: Evolution 2.32.2 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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? If it goes away, its the cgroup balancing, if its still there its elsewhere.