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=-3.9 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=no 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 9F06FC4363A for ; Mon, 5 Oct 2020 07:12:52 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 469712078E for ; Mon, 5 Oct 2020 07:12:52 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b="LlqX0qIb" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1725904AbgJEHMv (ORCPT ); Mon, 5 Oct 2020 03:12:51 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56402 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725870AbgJEHMv (ORCPT ); Mon, 5 Oct 2020 03:12:51 -0400 Received: from mail-lj1-x243.google.com (mail-lj1-x243.google.com [IPv6:2a00:1450:4864:20::243]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8762DC0613CE for ; Mon, 5 Oct 2020 00:12:50 -0700 (PDT) Received: by mail-lj1-x243.google.com with SMTP id p15so2096809ljj.8 for ; Mon, 05 Oct 2020 00:12:50 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=s0vfflwrEayo2u9kyCaw6oJScvExNNpNO92iI4ntapU=; b=LlqX0qIbIj+h9jiBsIPme6+CEDD4iZ3Ga1DJinaKQ6T79iiShrphsFJx68uzTRut9x ps4BiG0Y+pFOXzkkZYvlwt1XAjLvTHqlo4zn6vpjdkcP6rXpfnHwZiEAK0KUBp5xxO4Q 03Llzd2BARNjIJcnN0cZY6kvZLRE5zyjJvIbLMBwaKCo/mQPdd2PL9IbfIXnrMBiDl4j S08NgCURfJkt7PdJ7rfIsZlRpuJCdboOM0f4hGEVsR77SLInJRa6NjDz3DmRJDptnotf cBuO2jTmk0TfYlvCIVyu3FM2bSCaZmnnYDEd5pKutFY73VCi/ObjLLE9mMHOJPSHYspl YvEA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=s0vfflwrEayo2u9kyCaw6oJScvExNNpNO92iI4ntapU=; b=ufMq8FkCxZ4PFixFTn6eGJ/abya4OcVvuFR2UKx3fUjZP/RtKSMNo0r90Mbq6xA9Eh tziW0A0WBVwDlya4Mc48mQ/rGHweaSyhJ59eY38sjm8YLRd5M7/4aChLOJEPwFRvKo4D hYTzuyTg3IsGFVhQnc0RMmn7mZ+jskzEAiYEp3uiohGfzPgwMAHCKxhaS7lv0AuqCTZp K5wXqiLZ+UOXxhx0wctrPJpsPlKlWRUn59mhdNj4A4m833m3vsHfoQxF5fOn8hsaKeOK ZEsJTmhxzSwvYA9u6YuEYIrXewEuQH6wodB6KQ/LEbjBD6tBqiApzJPAI4XpBrNG6qyc fc5A== X-Gm-Message-State: AOAM532zTk6+GORZQHeIAUnZdKC/XM/193RHfH2WJ8W0zx+VwspYTnRd Etu8VWbVoFeu65b9rae5AMTUDxfIuTBvBDwZxPUvIQ== X-Google-Smtp-Source: ABdhPJxRhZVsFTGWvCNnc8j9FJ7pg05Nk/Zbu9r9M9/nL1PXWhGoCcBoP5oQJavxaxJgGxfkxhqq9Vz2y9fdnwxaLSE= X-Received: by 2002:a05:651c:505:: with SMTP id o5mr4231000ljp.177.1601881968820; Mon, 05 Oct 2020 00:12:48 -0700 (PDT) MIME-Version: 1.0 References: <20201004132716.GS393@shao2-debian> <20201005064959.GD2628@hirez.programming.kicks-ass.net> In-Reply-To: <20201005064959.GD2628@hirez.programming.kicks-ass.net> From: Vincent Guittot Date: Mon, 5 Oct 2020 09:12:37 +0200 Message-ID: Subject: Re: [sched/fair] fcf0553db6: netperf.Throughput_Mbps -30.8% regression To: Peter Zijlstra Cc: kernel test robot , Ingo Molnar , Rik van Riel , Ben Segall , Dietmar Eggemann , Juri Lelli , Linus Torvalds , Mel Gorman , Mike Galbraith , Steven Rostedt , Thomas Gleixner , LKML , lkp@lists.01.org, kbuild test robot , "Huang, Ying" , "Tang, Feng" , zhengjun.xing@intel.com, Aubrey Li , Chen Yu Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, 5 Oct 2020 at 08:50, Peter Zijlstra wrote: > > 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") > > This is the middle of a series that reworks the load balancer. Does this > regression still exist at the end of it? > > Which would be around: > > 57abff067a08 ("sched/fair: Rework find_idlest_group()") > > or possible a little later, Vincent? I would consider 6cf82d559e1a ("sched/cfs: fix spurious active migration") But even then, some fixes have been added. Mel perfectly described that