From mboxrd@z Thu Jan 1 00:00:00 1970 From: Gui Jianfeng Subject: Re: [RFC] IO scheduler based IO controller V6 Date: Tue, 28 Jul 2009 19:36:31 +0800 Message-ID: <4A6EE2BF.9040803@cn.fujitsu.com> References: <1246564917-19603-1-git-send-email-vgoyal@redhat.com> <4A6D0C9A.3080600@cn.fujitsu.com> <20090727125503.GA24449@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: In-Reply-To: <20090727125503.GA24449@redhat.com> Sender: linux-kernel-owner@vger.kernel.org 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 List-Id: dm-devel.ids Vivek Goyal wrote: > On Mon, Jul 27, 2009 at 10:10:34AM +0800, Gui Jianfeng wrote: >> Hi=EF=BC=8C >> >> Here are some fio test results for IO Controller V6 built and not bu= ilt. >> Iozone test results are also attached. >> >=20 > Hi Gui, >=20 > Thanks a lot for some performance numbers. It seems to be a mixed cha= rt. > Performance gains at some places and loss at others. I am curious abo= ut > that -7.0% for normal writes. Not sure what can contribute to that. >=20 > What was the value of "fairness" parameter when you ran those tests? = Can you > please set fairness =3D 0 and re-run the tests (if you have already n= ot done so). >=20 > By default fairness is set to 1 in V6. With fairness =3D 0, we should= be very > close to existing CFQ behavior. If not, then we need to dive deeper a= nd > see why variations are happening. Hi Vivek, I tested with default fairness value, i'll re-test it when fairness i= s set to 0. >=20 > Is it also possible to run the same tests with V7.=20 Sure. --=20 Regards Gui Jianfeng