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=-0.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS 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 81504C43141 for ; Thu, 21 Jun 2018 09:23:37 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 375EC20652 for ; Thu, 21 Jun 2018 09:23:37 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 375EC20652 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 S932792AbeFUJXf (ORCPT ); Thu, 21 Jun 2018 05:23:35 -0400 Received: from outbound-smtp12.blacknight.com ([46.22.139.17]:45057 "EHLO outbound-smtp12.blacknight.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932591AbeFUJXe (ORCPT ); Thu, 21 Jun 2018 05:23:34 -0400 Received: from mail.blacknight.com (pemlinmail05.blacknight.ie [81.17.254.26]) by outbound-smtp12.blacknight.com (Postfix) with ESMTPS id C16091C29CB for ; Thu, 21 Jun 2018 10:23:32 +0100 (IST) Received: (qmail 6353 invoked from network); 21 Jun 2018 09:23:32 -0000 Received: from unknown (HELO techsingularity.net) (mgorman@techsingularity.net@[37.228.237.171]) by 81.17.254.9 with ESMTPSA (DHE-RSA-AES256-SHA encrypted, authenticated); 21 Jun 2018 09:23:32 -0000 Date: Thu, 21 Jun 2018 10:23:32 +0100 From: Mel Gorman To: Jirka Hladky Cc: Jakub Racek , linux-kernel , "Rafael J. Wysocki" , Len Brown , linux-acpi@vger.kernel.org, "kkolakow@redhat.com" Subject: Re: [4.17 regression] Performance drop on kernel-4.17 visible on Stream, Linpack and NAS parallel benchmarks Message-ID: <20180621092331.p2pmaiu6563kp5u2@techsingularity.net> References: <20180614083640.dekqhsopoefnfhb4@techsingularity.net> <20180615112522.3wujbq7bajof57qx@techsingularity.net> <20180615135212.wq45co7ootvdeo2f@techsingularity.net> <20180619151803.bu6pehdu6wbd6l5x@techsingularity.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 Wed, Jun 20, 2018 at 07:25:19PM +0200, Jirka Hladky wrote: > Hi Mel and others, > > I would like to let you know that I have tested following patch > Understood. FWIW, there is a lot in flight at the moment but the first likely patch is removing rate limiting entirely and see what falls out. The rest of the experiment series deals with fast-scan-start, reset of preferred_nid on cross-node load balancing and dealing with THP false sharing but it's all preliminary and untested. Furthermore, matters have been complicated by the posting of "Fixes for sched/numa_balancing". My own testing indicates that this helped which means that I need to review this first and then rebase anything else on top of it. I would also suggest you test that series paying particular attention to whether it a) improves performance and b) how close it gets to the revert in terms of overall performance. -- Mel Gorman SUSE Labs