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=-10.3 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 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 B6109C4363C for ; Sun, 4 Oct 2020 16:21:15 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 839F1206B5 for ; Sun, 4 Oct 2020 16:21:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726128AbgJDQVO (ORCPT ); Sun, 4 Oct 2020 12:21:14 -0400 Received: from mx2.suse.de ([195.135.220.15]:54814 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726077AbgJDQVO (ORCPT ); Sun, 4 Oct 2020 12:21:14 -0400 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id CEAF3AC3C; Sun, 4 Oct 2020 16:21:12 +0000 (UTC) Date: Sun, 4 Oct 2020 17:21:08 +0100 From: Mel Gorman To: kernel test robot Cc: Vincent Guittot , Ingo Molnar , Rik van Riel , Ben Segall , Dietmar Eggemann , Juri Lelli , Linus Torvalds , Mike Galbraith , Peter Zijlstra , Steven Rostedt , Thomas Gleixner , LKML , lkp@lists.01.org, lkp@intel.com, ying.huang@intel.com, feng.tang@intel.com, zhengjun.xing@intel.com, aubrey.li@linux.intel.com, yu.c.chen@intel.com Subject: Re: [sched/fair] fcf0553db6: netperf.Throughput_Mbps -30.8% regression Message-ID: <20201004162108.GC3165@suse.de> References: <20201004132716.GS393@shao2-debian> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-15 Content-Disposition: inline In-Reply-To: <20201004132716.GS393@shao2-debian> User-Agent: Mutt/1.10.1 (2018-07-13) Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sun, Oct 04, 2020 at 09:27:16PM +0800, kernel test robot wrote: > Greeting, > > FYI, we noticed a -30.8% regression of netperf.Throughput_Mbps due to commit: > > > commit: fcf0553db6f4c79387864f6e4ab4a891601f395e ("sched/fair: Remove meaningless imbalance calculation") > https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master > This commit was the start of a series that made large changes to load balancing. The series was not bisect-safe and has since been reconciled with the NUMA balancing. Any workload with a potential load balancing problem has to be checked against the latest kernel to see if the problem persists there. If it does, then tip/sched/core should be checked or 5.10-rc1 when it comes out as tip has a few more LB changes pending. -- Mel Gorman SUSE Labs