From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 76FBDC31E45 for ; Thu, 13 Jun 2019 19:13:15 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 59E542054F for ; Thu, 13 Jun 2019 19:13:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728627AbfFMTNO (ORCPT ); Thu, 13 Jun 2019 15:13:14 -0400 Received: from outgoing-stata.csail.mit.edu ([128.30.2.210]:36676 "EHLO outgoing-stata.csail.mit.edu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725842AbfFMTNN (ORCPT ); Thu, 13 Jun 2019 15:13:13 -0400 Received: from [4.30.142.84] (helo=srivatsab-a01.vmware.com) by outgoing-stata.csail.mit.edu with esmtpsa (TLS1.2:RSA_AES_128_CBC_SHA1:128) (Exim 4.82) (envelope-from ) id 1hbV9n-0009Ya-TR; Thu, 13 Jun 2019 15:13:08 -0400 Subject: Re: CFQ idling kills I/O performance on ext4 with blkio cgroup controller To: Paolo Valente Cc: linux-fsdevel@vger.kernel.org, linux-block , linux-ext4@vger.kernel.org, cgroups@vger.kernel.org, kernel list , Jens Axboe , Jan Kara , Jeff Moyer , Theodore Ts'o , amakhalov@vmware.com, anishs@vmware.com, srivatsab@vmware.com, Ulf Hansson , Linus Walleij References: <8d72fcf7-bbb4-2965-1a06-e9fc177a8938@csail.mit.edu> <0e3fdf31-70d9-26eb-7b42-2795d4b03722@csail.mit.edu> <686D6469-9DE7-4738-B92A-002144C3E63E@linaro.org> <01d55216-5718-767a-e1e6-aadc67b632f4@csail.mit.edu> <6FE0A98F-1E3D-4EF6-8B38-2C85741924A4@linaro.org> <2A58C239-EF3F-422B-8D87-E7A3B500C57C@linaro.org> <5b71028c-72f0-73dd-0cd5-f28ff298a0a3@csail.mit.edu> <0d6e3c02-1952-2177-02d7-10ebeb133940@csail.mit.edu> <7B74A790-BD98-412B-ADAB-3B513FB1944E@linaro.org> <6a6f4aa4-fc95-f132-55b2-224ff52bd2d8@csail.mit.edu> <7c5e9d11-4a3d-7df4-c1e6-7c95919522ab@csail.mit.edu> <43486E4F-2237-4E40-BDFE-07CFCCFFFA25@linaro.org> From: "Srivatsa S. Bhat" Message-ID: <72856150-d678-42bd-0377-82dbee6513ba@csail.mit.edu> Date: Thu, 13 Jun 2019 12:13:05 -0700 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:60.0) Gecko/20100101 Thunderbird/60.7.0 MIME-Version: 1.0 In-Reply-To: <43486E4F-2237-4E40-BDFE-07CFCCFFFA25@linaro.org> Content-Type: text/plain; charset=windows-1252 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 6/12/19 10:46 PM, Paolo Valente wrote: > >> Il giorno 12 giu 2019, alle ore 00:34, Srivatsa S. Bhat ha scritto: >> [...] >> >> Hi Paolo, >> > > Hi > >> Hope you are doing great! >> > > Sort of, thanks :) > >> I was wondering if you got a chance to post these patches to LKML for >> review and inclusion... (No hurry, of course!) >> > > > I'm having troubles testing these new patches on 5.2-rc4. As it > happened with the first release candidates for 5.1, the CPU of my test > machine (Intel Core i7-2760QM@2.40GHz) is so slowed down that results > are heavily distorted with every I/O scheduler. > Oh, that's unfortunate! > Unfortunately, I'm not competent enough to spot the cause of this > regression in a feasible amount of time. I hope it'll go away with > next release candidates, or I'll test on 5.1. > Sounds good to me! >> Also, since your fixes address the performance issues in BFQ, do you >> have any thoughts on whether they can be adapted to CFQ as well, to >> benefit the older stable kernels that still support CFQ? >> > > I have implanted my fixes on the existing throughput-boosting > infrastructure of BFQ. CFQ doesn't have such an infrastructure. > > If you need I/O control with older kernels, you may want to check my > version of BFQ for legacy block, named bfq-sq and available in this > repo: > https://github.com/Algodev-github/bfq-mq/ > Great! Thank you for sharing this! > I'm willing to provide you with any information or help if needed. > Thank you! Regards, Srivatsa VMware Photon OS