From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S966248AbcIZMBx (ORCPT ); Mon, 26 Sep 2016 08:01:53 -0400 Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:45344 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S965077AbcIZMBv (ORCPT ); Mon, 26 Sep 2016 08:01:51 -0400 Subject: Re: group scheduler regression since 4.3 (bisect 9d89c257d sched/fair: Rewrite runnable load and utilization average tracking) To: Peter Zijlstra References: <45222b6f-4849-f1f4-fdf5-2a26ac9a3ed4@de.ibm.com> <20160926105621.GZ5016@twins.programming.kicks-ass.net> <20160926115300.GA5016@twins.programming.kicks-ass.net> Cc: Yuyang Du , Ingo Molnar , Linux Kernel Mailing List , vincent.guittot@linaro.org, Morten.Rasmussen@arm.com, dietmar.eggemann@arm.com, pjt@google.com, bsegall@google.com From: Christian Borntraeger Date: Mon, 26 Sep 2016 14:01:43 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.3.0 MIME-Version: 1.0 In-Reply-To: <20160926115300.GA5016@twins.programming.kicks-ass.net> Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit X-TM-AS-MML: disable X-Content-Scanned: Fidelis XPS MAILER x-cbid: 16092612-0008-0000-0000-000002D27005 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 16092612-0009-0000-0000-00001A1ABC39 Message-Id: <4c4e8838-9a6a-62b9-a8b7-48e4d375604e@de.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:,, definitions=2016-09-26_06:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 suspectscore=0 malwarescore=0 phishscore=0 adultscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1609020000 definitions=main-1609260230 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 09/26/2016 01:53 PM, Peter Zijlstra wrote: > On Mon, Sep 26, 2016 at 01:42:05PM +0200, Christian Borntraeger wrote: >> On 09/26/2016 12:56 PM, Peter Zijlstra wrote: > >>> One of the differences in the old and new thing is being addressed by >>> these patches: >>> >>> https://lkml.kernel.org/r/1473666472-13749-1-git-send-email-vincent.guittot@linaro.org >>> >>> Could you see if those patches make a difference? If not, we'll have to >>> go poke elsewhere ofcourse ;-) >> >> Those patches do not apply cleanly on v4.7, linux/master or next/master. >> Is there a good branch to test these patches? > > They seemed to apply for me on tip/sched/core, I pushed out a branch for > you that has them on. > > git://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git sched/propagate > > I didn't boot the result though; but they applied without issue. They applied ok on next from 9/13. Things go even worse. With this host configuration: CPU NODE BOOK SOCKET CORE L1d:L1i:L2d:L2i ONLINE CONFIGURED ADDRESS 0 0 0 0 0 0:0:0:0 yes yes 0 1 0 0 0 0 1:1:1:1 yes yes 1 2 0 0 0 1 2:2:2:2 yes yes 2 3 0 0 0 1 3:3:3:3 yes yes 3 4 0 0 1 2 4:4:4:4 yes yes 4 5 0 0 1 2 5:5:5:5 yes yes 5 6 0 0 1 3 6:6:6:6 yes yes 6 7 0 0 1 3 7:7:7:7 yes yes 7 8 0 0 1 4 8:8:8:8 yes yes 8 9 0 0 1 4 9:9:9:9 yes yes 9 10 0 0 1 5 10:10:10:10 yes yes 10 11 0 0 1 5 11:11:11:11 yes yes 11 12 0 0 1 6 12:12:12:12 yes yes 12 13 0 0 1 6 13:13:13:13 yes yes 13 14 0 0 1 7 14:14:14:14 yes yes 14 15 0 0 1 7 15:15:15:15 yes yes 15 the guest was running either on 0-3 or on 4-15, but never used the full system. With group scheduling disabled everything was good again. So looks like that this bug has also some dependency on on the host topology. Christian