Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752156AbZG2JJB (ORCPT ); Wed, 29 Jul 2009 05:09:01 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751635AbZG2JJA (ORCPT ); Wed, 29 Jul 2009 05:09:00 -0400 Received: from cn.fujitsu.com ([222.73.24.84]:49826 "EHLO song.cn.fujitsu.com" rhost-flags-OK-FAIL-OK-OK) by vger.kernel.org with ESMTP id S1751051AbZG2JJA (ORCPT ); Wed, 29 Jul 2009 05:09:00 -0400 Message-ID: <4A701155.4060908@cn.fujitsu.com> Date: Wed, 29 Jul 2009 17:07:33 +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, containers@lists.linux-foundation.org, dm-devel@redhat.com, jens.axboe@oracle.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, jbaron@redhat.com, agk@redhat.com, snitzer@redhat.com, akpm@linux-foundation.org, peterz@infradead.org Subject: Re: [RFC] IO scheduler based IO controller V6 References: <1246564917-19603-1-git-send-email-vgoyal@redhat.com> <4A6D0C9A.3080600@cn.fujitsu.com> <20090727125503.GA24449@redhat.com> In-Reply-To: <20090727125503.GA24449@redhat.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3324 Lines: 119 Vivek Goyal wrote: > On Mon, Jul 27, 2009 at 10:10:34AM +0800, Gui Jianfeng wrote: >> Hi， >> >> Here are some fio test results for IO Controller V6 built and not built. >> Iozone test results are also attached. >> > > Hi Gui, > > Thanks a lot for some performance numbers. It seems to be a mixed chart. > Performance gains at some places and loss at others. I am curious about > that -7.0% for normal writes. Not sure what can contribute to that. > > What was the value of "fairness" parameter when you ran those tests? Can you > please set fairness = 0 and re-run the tests (if you have already not done so). > > By default fairness is set to 1 in V6. With fairness = 0, we should be very > close to existing CFQ behavior. If not, then we need to dive deeper and > see why variations are happening. Hi Vivek, I re-run the fio test under V6 for normal reads and writes with fairness == 0. It seems the performance gets a little better for normal writes than before. Mode Normal read | Random read | Normal write | Random write 2.6.31-rc1 53,547KiB/s 2,894KiB/s 44,088KiB/s 8,450KiB/s V6(fairness = 0) 53,199KiB/s 2,847KiB/s 41,898KiB/s 8,582KiB/s Performance 0% -1.6% -4.9% +1.5% > > Is it also possible to run the same tests with V7. > > Thanks > Vivek > >> Arch: X86 >> Mem: 1G >> Disk: 320G >> IO Scheduler: CFQ >> >> ============ >> By normal read and write syscall. >> >> Block Size:32K >> File Size: 1G * 10 >> >> Mode Normal read | Random read | Normal write | Random write | Direct read | Direct write >> >> 2.6.31-rc1 47,932KiB/s 3,566KiB/s 45,693KiB/s 8,501KiB/s 50,088KiB/s 43,473KiB/s >> >> 2.6.31-rc1-Vivek-V6 47,231KiB/s 3,411KiB/s 42,451KiB/s 8,714KiB/s 51,284KiB/s 42,341KiB/s >> >> Performance -1.5% -4.4% -7.0% +2.5% +2.4% -2.6% >> >> ============ >> >> By mmap. >> >> Block Size:32K >> File Size: 500M >> >> Mode Normal read | Random read | Normal write | Random write >> >> 2.6.31-rc1 49,951KiB/s 3,245KiB/s 21,950KiB/s 2,771KiB/s >> >> 2.6.31-rc1-Vivek-V6 49,951KiB/s 3,154KiB/s 22,593KiB/s 2,648KiB/s >> >> Performance 0% -2.8% +2.9% -4.4% >> >> ============ >> >> By libaio calls >> >> Block Size:32K >> File Size: 500M >> >> Mode Normal read | Random read | Normal write | Random write >> >> 2.6.31-rc1 49,447KiB/s 3,296KiB/s 57,519KiB/s 21,093KiB/s >> >> 2.6.31-rc1-Vivek-V6 50,142KiB/s 3,238KiB/s 57,791KiB/s 21,283KiB/s >> >> Performance +1.4% -1.8% 0% +0.1% >> >> ============ >> >> >> >> >> >> >> >> >> >> >> > > > > > > -- Regards Gui Jianfeng -- 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/