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=-2.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS,USER_AGENT_NEOMUTT 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 34AC2ECE560 for ; Mon, 17 Sep 2018 13:07:42 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id CF1CC2088F for ; Mon, 17 Sep 2018 13:07:41 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org CF1CC2088F Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=techsingularity.net Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728303AbeIQSez (ORCPT ); Mon, 17 Sep 2018 14:34:55 -0400 Received: from outbound-smtp26.blacknight.com ([81.17.249.194]:59266 "EHLO outbound-smtp26.blacknight.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726169AbeIQSey (ORCPT ); Mon, 17 Sep 2018 14:34:54 -0400 Received: from mail.blacknight.com (pemlinmail05.blacknight.ie [81.17.254.26]) by outbound-smtp26.blacknight.com (Postfix) with ESMTPS id 7D5E3B8A0F for ; Mon, 17 Sep 2018 14:07:37 +0100 (IST) Received: (qmail 2790 invoked from network); 17 Sep 2018 13:07:37 -0000 Received: from unknown (HELO techsingularity.net) (mgorman@techsingularity.net@[193.179.3.151]) by 81.17.254.9 with ESMTPSA (DHE-RSA-AES256-SHA encrypted, authenticated); 17 Sep 2018 13:07:35 -0000 Date: Mon, 17 Sep 2018 14:06:29 +0100 From: Mel Gorman To: Jirka Hladky Cc: Peter Zijlstra , Srikar Dronamraju , Jakub Ra??ek , linux-kernel , "kkolakow@redhat.com" , Ingo Molnar Subject: Re: [SCHEDULER] Performance drop in 4.19 compared to 4.18 kernel Message-ID: <20180917130629.nugwsgcsuoda6qf6@techsingularity.net> References: <20180907125649.GA3995@linux.vnet.ibm.com> <20180907131923.GB24106@hirez.programming.kicks-ass.net> <20180907134420.GD3995@linux.vnet.ibm.com> <20180907135235.GE24106@hirez.programming.kicks-ass.net> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-15 Content-Disposition: inline In-Reply-To: User-Agent: NeoMutt/20170912 (1.9.0) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Sep 14, 2018 at 04:50:20PM +0200, Jirka Hladky wrote: > Hi Peter and Srikar, > > > I have bounced the 5 patches to you, (one of the 6 has not been applied by > > Peter) so I have skipped that. > > They can also be fetched from > > http://lore.kernel.org/lkml/1533276841-16341-1-git-send-email-srikar@linux.vnet.ibm.com > > I'm sorry for the delay, we have finally the results for the above > kernel. The performance results look good compared to 4.19 vanilla and > are about the same as Mel's sched-numa-fast-crossnode-v1r12 patch set > for 4.18: > > Compared to kernel-4.19.0-0.rc1.1 > > * Improvement upto 20% for SPECjbb2005, SPECjvm2008 benchmarks > * Improvement upto 50% for stream benchmark > * Improvement upto 100% for the NAS benchmark (sp_C subtest, 8 > threads on 4 NUMA system with 4x E5-4610 v2 @ 2.30GHz, 64 cores in > total) > > When I compare it against Mel's patchset > (git://git.kernel.org/pub/scm/linux/kernel/git/mel/linux.git > sched-numa-fast-crossnode-v1r12) > > * Mel's kernel is about 15% faster for stream benchmarks > * The other benchmarks show very similar results with both kernels > > Mel's patchset eliminates NUMA migration rate limits, this is > presumbly the reason for the good stream results. > > Do you have any update when the current patchset could be merged into > the upstream kernel? > I'm travelling at the moment but when I get back, I'll see what's in the tip tree with respect to Srikar's patches and then rebase the fast-migration patches on top and reconfirm they still behave as expected. Assuming they do, I'll resend them.