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=-2.3 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS,USER_AGENT_MUTT 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 7BB7FC004D3 for ; Wed, 24 Oct 2018 06:41:08 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 25C1C2054F for ; Wed, 24 Oct 2018 06:41:08 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 25C1C2054F Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=intel.com 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 S1727058AbeJXPHs (ORCPT ); Wed, 24 Oct 2018 11:07:48 -0400 Received: from mga03.intel.com ([134.134.136.65]:43875 "EHLO mga03.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726338AbeJXPHs (ORCPT ); Wed, 24 Oct 2018 11:07:48 -0400 X-Amp-Result: UNSCANNABLE X-Amp-File-Uploaded: False Received: from orsmga005.jf.intel.com ([10.7.209.41]) by orsmga103.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 23 Oct 2018 23:41:05 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.54,419,1534834800"; d="scan'208";a="268308235" Received: from aaronlu.sh.intel.com (HELO intel.com) ([10.239.159.44]) by orsmga005.jf.intel.com with ESMTP; 23 Oct 2018 23:41:01 -0700 Date: Wed, 24 Oct 2018 14:41:00 +0800 From: Aaron Lu To: Patrick Bellasi Cc: "Ye, Xiaolong" , Joel Fernandes , Juri Lelli , Todd Kjos , Stephen Rothwell , Peter Zijlstra , Paul Turner , "Wysocki, Rafael J" , Morten Rasmussen , Dietmar Eggemann , Steve Muckle , "lkp@01.org" , Viresh Kumar , Chris Redpath , Thomas Gleixner , Linus Torvalds , Ingo Molnar , LKML Subject: Re: [LKP] [lkp-robot] [sched/fair] d519329f72: unixbench.score -9.9% regression Message-ID: <20181024064100.GA27054@intel.com> References: <20180402032000.GD3101@yexl-desktop> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20180402032000.GD3101@yexl-desktop> User-Agent: Mutt/1.10.1 (2018-07-13) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Apr 02, 2018 at 11:20:00AM +0800, Ye, Xiaolong wrote: > > Greeting, > > FYI, we noticed a -9.9% regression of unixbench.score due to commit: > > > commit: d519329f72a6f36bc4f2b85452640cfe583b4f81 ("sched/fair: Update util_est only on util_avg updates") > https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git master > > in testcase: unixbench > on test machine: 8 threads Intel(R) Core(TM) i7 CPU 870 @ 2.93GHz with 6G memory > with following parameters: > > runtime: 300s > nr_task: 100% > test: execl > > test-description: UnixBench is the original BYTE UNIX benchmark suite aims to test performance of Unix-like system. > test-url: https://github.com/kdlucas/byte-unixbench I tested this workload on different machines with this commit d519329f72a6f36bc4f2b85452 and its parent a07630b8b2c16f82, I also tested with v4.19-rc8 to see if the regression is gone - the performance drop is there with v4.19-rc8 and with different machines so I assume this regression is not solved yet. Here are detailed data: cmdline used to run this workload: ./Run execl -c $nr_cpu -i 30 lkp-ivb-d04(Ivybridge desktop, 4 CPUs) a07630b8b2c16f82 d519329f72a6f36bc4f2b85452 ---------------- -------------------------- %stddev %change %stddev \ | \ 2924 -8.7% 2669 unixbench.score a07630b8b2c16f82fd5b71d890079f4dd7599c1d/avg.json: "unixbench.score": 2924.3333333333335, d519329f72a6f36bc4f2b85452640cfe583b4f81/avg.json: "unixbench.score": 2669.5333333333333, v4.19-rc8/avg.json: "unixbench.score": 2611.733333333333, lkp-hsw-d01(Haswell desktop, 8 CPUs) a07630b8b2c16f82 d519329f72a6f36bc4f2b85452 ---------------- -------------------------- %stddev %change %stddev \ | \ 7090 -9.4% 6421 unixbench.score a07630b8b2c16f82fd5b71d890079f4dd7599c1d/avg.json: "unixbench.score": 7090.400000000001, d519329f72a6f36bc4f2b85452640cfe583b4f81/avg.json: "unixbench.score": 6421.233333333333, v4.19-rc8/avg.json: "unixbench.score": 6431.933333333333, lkp-skl-2sp2(2 sockets Skylake, 80 CPUs) a07630b8b2c16f82 d519329f72a6f36bc4f2b85452 ---------------- -------------------------- %stddev %change %stddev \ | \ 9657 ± 2% -3.3% 9334 unixbench.score a07630b8b2c16f82fd5b71d890079f4dd7599c1d/avg.json: "unixbench.score": 9657.6, d519329f72a6f36bc4f2b85452640cfe583b4f81/avg.json: "unixbench.score": 9334.9, v4.19-rc8/avg.json: "unixbench.score": 9278.333333333334, Please let me know if you need other information, thanks.