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=-5.5 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,NICE_REPLY_A,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 34F95C4363D for ; Thu, 24 Sep 2020 16:37:46 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E5C97238E3 for ; Thu, 24 Sep 2020 16:37:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727216AbgIXQho (ORCPT ); Thu, 24 Sep 2020 12:37:44 -0400 Received: from mga03.intel.com ([134.134.136.65]:35899 "EHLO mga03.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726458AbgIXQho (ORCPT ); Thu, 24 Sep 2020 12:37:44 -0400 IronPort-SDR: 7YGs3SZBXbVdcfMM8f0c9KTuKqpFHecLv9q9rJTfa5PUcXSZSXx9zET/mfYfW1SyL8i35xLbd8 H99Tt3w2PnyQ== X-IronPort-AV: E=McAfee;i="6000,8403,9754"; a="161329336" X-IronPort-AV: E=Sophos;i="5.77,298,1596524400"; d="scan'208";a="161329336" X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga004.fm.intel.com ([10.253.24.48]) by orsmga103.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 24 Sep 2020 09:37:43 -0700 IronPort-SDR: y4ozkSmUoKFsjLWUM+TiqrRgqDPo4Cf/YYkIkwUT5TJAvnJOj6ZrzJFtSTO3SvSyZ5+9Ji4cNK QcdBVWTj+/Nw== X-IronPort-AV: E=Sophos;i="5.77,298,1596524400"; d="scan'208";a="336054758" Received: from schen9-mobl.amr.corp.intel.com ([10.254.89.92]) by fmsmga004-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 24 Sep 2020 09:37:42 -0700 Subject: Re: [RFC PATCH v2] sched/fair: select idle cpu from idle cpumask in sched domain To: Vincent Guittot , "Li, Aubrey" Cc: Mel Gorman , Ingo Molnar , Peter Zijlstra , Juri Lelli , Dietmar Eggemann , Steven Rostedt , Ben Segall , Valentin Schneider , linux-kernel , Qais Yousef , Jiang Biao References: <20200916043103.606132-1-aubrey.li@linux.intel.com> <20200916110039.GG3117@suse.de> <78d608f2-b974-e940-da32-b37777bc405a@linux.intel.com> From: Tim Chen Message-ID: <40ee756f-1f27-b17e-6292-d8069a56e3c8@linux.intel.com> Date: Thu, 24 Sep 2020 09:37:33 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.6.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 9/22/20 12:14 AM, Vincent Guittot wrote: >> >>>> >>>> And a quick test with hackbench on my octo cores arm64 gives for 12 Vincent, Is it octo (=10) or octa (=8) cores on a single socket for your system? The L2 is per core or there are multiple L2s shared among groups of cores? Wonder if placing the threads within a L2 or not within an L2 could cause differences seen with Aubrey's test. Tim