From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933167AbbLOCMl (ORCPT ); Mon, 14 Dec 2015 21:12:41 -0500 Received: from mx1.redhat.com ([209.132.183.28]:53243 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932946AbbLOCMk (ORCPT ); Mon, 14 Dec 2015 21:12:40 -0500 Subject: Re: sched : performance regression 24% between 4.4rc4 and 4.3 kernel To: Jirka Hladky , Mike Galbraith References: <1449903863.9638.8.camel@gmail.com> <1449931045.7411.8.camel@gmail.com> Cc: linux-kernel@vger.kernel.org, Peter Zijlstra , Ingo Molnar From: Rik van Riel Message-ID: <566F7715.3020905@redhat.com> Date: Mon, 14 Dec 2015 21:12:37 -0500 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.3.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 12/14/2015 06:52 PM, Jirka Hladky wrote: > Hi all, > > I have the results of bisecting: > > first bad commit: [973759c80db96ed4b4c5cb85ac7d48107f801371] Merge tag > 'v4.3-rc1' into sched/core, to refresh the branch > > Could you please have a look at this commit why it has caused the > performance regression when running 4 stream benchmarks in parallel on 4 > NUMA node server? That is a merge commit. It contains no actual code changes. > Please let me know if you need additional data. git bisect log is bellow. It looks like "git bisect" may have led you astray. I am not sure what debugging tool to use to figure out which of the patches from some merged-in branch caused the issue, but hopefully one of the people reading this email know a trick. -- All rights reversed