From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753853AbZHaBKi (ORCPT ); Sun, 30 Aug 2009 21:10:38 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752392AbZHaBKi (ORCPT ); Sun, 30 Aug 2009 21:10:38 -0400 Received: from cn.fujitsu.com ([222.73.24.84]:63438 "EHLO song.cn.fujitsu.com" rhost-flags-OK-FAIL-OK-OK) by vger.kernel.org with ESMTP id S1751582AbZHaBKh (ORCPT ); Sun, 30 Aug 2009 21:10:37 -0400 Message-ID: <4A9B22BF.6010707@cn.fujitsu.com> Date: Mon, 31 Aug 2009 09:09:19 +0800 From: Gui Jianfeng User-Agent: Thunderbird 2.0.0.5 (Windows/20070716) MIME-Version: 1.0 To: Vivek Goyal CC: linux-kernel@vger.kernel.org, jens.axboe@oracle.com, containers@lists.linux-foundation.org, dm-devel@redhat.com, nauman@google.com, dpshah@google.com, lizf@cn.fujitsu.com, mikew@google.com, fchecconi@gmail.com, paolo.valente@unimore.it, ryov@valinux.co.jp, fernando@oss.ntt.co.jp, s-uchida@ap.jp.nec.com, taka@valinux.co.jp, jmoyer@redhat.com, dhaval@linux.vnet.ibm.com, balbir@linux.vnet.ibm.com, righi.andrea@gmail.com, m-ikeda@ds.jp.nec.com, agk@redhat.com, akpm@linux-foundation.org, peterz@infradead.org, jmarchan@redhat.com, torvalds@linux-foundation.org, mingo@elte.hu, riel@redhat.com Subject: Re: [RFC] IO scheduler based IO controller V9 References: <1251495072-7780-1-git-send-email-vgoyal@redhat.com> In-Reply-To: <1251495072-7780-1-git-send-email-vgoyal@redhat.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Vivek Goyal wrote: > Hi All, > > Here is the V9 of the IO controller patches generated on top of 2.6.31-rc7. > > For ease of patching, a consolidated patch is available here. > > http://people.redhat.com/~vgoyal/io-controller/io-scheduler-based-io-controller-v9.patch > > Changes from V8 > =============== > - Implemented bdi like congestion semantics for io group also. Now once an > io group gets congested, we don't clear the congestion flag until number > of requests goes below nr_congestion_off. > > This helps in getting rid of Buffered write performance regression we > were observing with io controller patches. > > Gui, can you please test it and see if this version is better in terms > of your buffered write tests. Ok, will do. -- Regards Gui Jianfeng