From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752833Ab1ITLLG (ORCPT ); Tue, 20 Sep 2011 07:11:06 -0400 Received: from e23smtp09.au.ibm.com ([202.81.31.142]:39831 "EHLO e23smtp09.au.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751478Ab1ITLLD (ORCPT ); Tue, 20 Sep 2011 07:11:03 -0400 Date: Tue, 20 Sep 2011 16:39:38 +0530 From: Kamalesh Babulal To: Venki Pallipadi Cc: Peter Zijlstra , Srivatsa Vaddagiri , Paul Turner , Vladimir Davydov , "linux-kernel@vger.kernel.org" , Bharata B Rao , Dhaval Giani , Vaidyanathan Srinivasan , Ingo Molnar , Pavel Emelianov , Ken Chen Subject: Re: CFS Bandwidth Control - Test results of cgroups tasks pinned vs unpinnede Message-ID: <20110920110937.GA5911@linux.vnet.ibm.com> Reply-To: Kamalesh Babulal References: <1315931775.5977.29.camel@twins> <20110913175425.GB3062@linux.vnet.ibm.com> <1315937995.4226.9.camel@twins> <20110913182841.GO11100@linux.vnet.ibm.com> <1315938646.4226.12.camel@twins> <20110913183502.GP11100@linux.vnet.ibm.com> <20110915175537.GA17701@linux.vnet.ibm.com> <1316123323.4060.24.camel@twins> <20110919175129.GA11164@linux.vnet.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: User-Agent: Mutt/1.5.21 (2010-09-15) x-cbid: 11092002-3568-0000-0000-00000054A4FB Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org * Venki Pallipadi [2011-09-19 17:38:26]: > On Mon, Sep 19, 2011 at 10:51 AM, Kamalesh Babulal > wrote: > > * Peter Zijlstra [2011-09-15 23:48:43]: > > > >> On Thu, 2011-09-15 at 23:25 +0530, Kamalesh Babulal wrote: > >> > 2.6.38          | 1551  | 48    | 62    | 47    | 50    | > >> > ----------------+-------+-------+-------+-------+-------+ > >> > 2.6.39          | 3784  | 457   | 722   | 3209  | 1037  | > >> > >> I'd say we wrecked it going from .38 to .39 and only made it worse after > >> that. > > > > after reverting the commit 866ab43efd325fae8889ea, of the patches > > went between .38 and .39 reduces the ping pong of the tasks. > > There was a side-effect from 866ab43efd325fae8889ea that Ken > identified and fixed later in commit > b0432d8f162c7d5d9537b4cb749d44076b76a783. I guess you are seeing the > same problem... (snip) 3.1-rc4+tip includes the commit b0432d8f162c7d5d. The number of task ping pongs has reduced with 3.1-rc4+tip, in comparison to 2.6.39 as seen in the below table. Reverting the commit 866ab43efd325fa on the 3.1-rc4+tip reduces the task bouncing to a good extend. > > ------------------------+-------+-------+-------+-------+-------+ > > Kernel                  | Run 1 | Run 2 | Run 3 | Run 4 | Run 5 | > > ------------------------+-------+-------+-------+-------+-------+ > > 2.6.39                  | 1542  | 2172  | 2727  | 120   | 3681  | > > ------------------------+-------+-------+-------+-------+-------+ > > 2.6.39 (with            |       |       |       |       |       | > > 866ab43efd reverted)    | 65    | 78    | 58    | 99    | 62    | > > ------------------------+-------+-------+-------+-------+-------+ > > 3.1-rc4+tip             |       |       |       |       |       | > > (e467f18f945c)          | 1219  | 2037  | 1943  | 772   | 1701  | > > ------------------------+-------+-------+-------+-------+-------+ > > 3.1-rc4+tip (e467f18f9) |       |       |       |       |       | > > (866ab43efd reverted)   | 64    | 45    | 59    | 59    | 69    | > > ------------------------+-------+-------+-------+-------+-------+ > >