Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755496AbZIBBAD (ORCPT ); Tue, 1 Sep 2009 21:00:03 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1755480AbZIBBAD (ORCPT ); Tue, 1 Sep 2009 21:00:03 -0400 Received: from cn.fujitsu.com ([222.73.24.84]:56990 "EHLO song.cn.fujitsu.com" rhost-flags-OK-FAIL-OK-OK) by vger.kernel.org with ESMTP id S1755479AbZIBBAC (ORCPT ); Tue, 1 Sep 2009 21:00:02 -0400 Message-ID: <4A9DC33E.6000408@cn.fujitsu.com> Date: Wed, 02 Sep 2009 08:58:38 +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 Content-Length: 1474 Lines: 41 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. Hi Vivek, Here are some performance numbers generated by fio test. It seems V9 performance is better than V8 especially for write case. Normal Read | Random Read | Normal Write | Random Write V8(Avg of 3 timers) 64667 KiB/s 3387 KiB/s 59197 KiB/s 9327 KiB/s V9(Avg of 3 timers) 65947 KiB/s 3528 KiB/s 61654 KiB/s 9744 KiB/s Performance +2.0% +4.1% +4.2% +4.5% -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/