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_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=no 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 D1B33C433FF for ; Mon, 5 Aug 2019 15:55:32 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id A00D820B1F for ; Mon, 5 Aug 2019 15:55:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729390AbfHEPzb (ORCPT ); Mon, 5 Aug 2019 11:55:31 -0400 Received: from mga11.intel.com ([192.55.52.93]:12163 "EHLO mga11.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728818AbfHEPzb (ORCPT ); Mon, 5 Aug 2019 11:55:31 -0400 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga002.fm.intel.com ([10.253.24.26]) by fmsmga102.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 05 Aug 2019 08:55:30 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.64,350,1559545200"; d="scan'208";a="202502080" Received: from schen9-desk.jf.intel.com (HELO [10.54.74.162]) ([10.54.74.162]) by fmsmga002.fm.intel.com with ESMTP; 05 Aug 2019 08:55:29 -0700 To: Julien Desfossez , "Li, Aubrey" Cc: Aaron Lu , Aubrey Li , Subhra Mazumdar , Vineeth Remanan Pillai , Nishanth Aravamudan , Peter Zijlstra , Ingo Molnar , Thomas Gleixner , Paul Turner , Linus Torvalds , Linux List Kernel Mailing , =?UTF-8?B?RnLDqWTDqXJpYyBXZWlzYmVja2Vy?= , Kees Cook , Greg Kerr , Phil Auld , Valentin Schneider , Mel Gorman , Pawan Gupta , Paolo Bonzini References: <20190612163345.GB26997@sinkpad> <635c01b0-d8f3-561b-5396-10c75ed03712@oracle.com> <20190613032246.GA17752@sinkpad> <20190619183302.GA6775@sinkpad> <20190718100714.GA469@aaronlu> <20190725143003.GA992@aaronlu> <20190726152101.GA27884@sinkpad> <7dc86e3c-aa3f-905f-3745-01181a3b0dac@linux.intel.com> <20190802153715.GA18075@sinkpad> From: Tim Chen Openpgp: preference=signencrypt Autocrypt: addr=tim.c.chen@linux.intel.com; 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Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.6.1 MIME-Version: 1.0 In-Reply-To: <20190802153715.GA18075@sinkpad> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 8/2/19 8:37 AM, Julien Desfossez wrote: > We tested both Aaron's and Tim's patches and here are our results. > > Test setup: > - 2 1-thread sysbench, one running the cpu benchmark, the other one the > mem benchmark > - both started at the same time > - both are pinned on the same core (2 hardware threads) > - 10 30-seconds runs > - test script: https://paste.debian.net/plainh/834cf45c > - only showing the CPU events/sec (higher is better) > - tested 4 tag configurations: > - no tag > - sysbench mem untagged, sysbench cpu tagged > - sysbench mem tagged, sysbench cpu untagged > - both tagged with a different tag > - "Alone" is the sysbench CPU running alone on the core, no tag > - "nosmt" is both sysbench pinned on the same hardware thread, no tag > - "Tim's full patchset + sched" is an experiment with Tim's patchset > combined with Aaron's "hack patch" to get rid of the remaining deep > idle cases > - In all test cases, both tasks can run simultaneously (which was not > the case without those patches), but the standard deviation is a > pretty good indicator of the fairness/consistency. Thanks for testing the patches and giving such detailed data. I came to realize that for my scheme, the accumulated deficit of forced idle could be wiped out in one execution of a task on the forced idle cpu, with the update of the min_vruntime, even if the execution time could be far less than the accumulated deficit. That's probably one reason my scheme didn't achieve fairness. Tim