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[23.128.96.18]) by mx.google.com with ESMTP id nq4si161045ejb.678.2020.09.24.10.45.23; Thu, 24 Sep 2020 10:45:47 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=intel.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728566AbgIXRne (ORCPT + 99 others); Thu, 24 Sep 2020 13:43:34 -0400 Received: from mga01.intel.com ([192.55.52.88]:58106 "EHLO mga01.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726477AbgIXRne (ORCPT ); Thu, 24 Sep 2020 13:43:34 -0400 IronPort-SDR: Z4fA312wpwMM609Zk9tOqePy4T04Cu8DQU5QOQ9KJamOMiQemaCFCKqdOKopMmj2NfzzYJTKjX 3hqm5hd4yvwA== X-IronPort-AV: E=McAfee;i="6000,8403,9754"; a="179377269" X-IronPort-AV: E=Sophos;i="5.77,298,1596524400"; d="scan'208";a="179377269" X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga004.fm.intel.com ([10.253.24.48]) by fmsmga101.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 24 Sep 2020 10:43:34 -0700 IronPort-SDR: uMkYnroberLWVUlj//n2+KQtl7lQjCroVrhI98rwLaBGasY7IUwFNbAUhjw2H8MzK17vrhZZkI IRDG5RLx2WfA== X-IronPort-AV: E=Sophos;i="5.77,298,1596524400"; d="scan'208";a="336085216" 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 10:43:33 -0700 Subject: Re: [RFC PATCH v2] sched/fair: select idle cpu from idle cpumask in sched domain To: Phil Auld Cc: Vincent Guittot , "Li, Aubrey" , 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> <40ee756f-1f27-b17e-6292-d8069a56e3c8@linux.intel.com> <20200924171339.GD29958@lorien.usersys.redhat.com> From: Tim Chen Message-ID: <129fceda-cf89-de74-f3fd-026c3c089d62@linux.intel.com> Date: Thu, 24 Sep 2020 10:43:12 -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: <20200924171339.GD29958@lorien.usersys.redhat.com> 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 9/24/20 10:13 AM, Phil Auld wrote: > On Thu, Sep 24, 2020 at 09:37:33AM -0700 Tim Chen wrote: >> >> >> 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? > > In what Romance language does octo mean 10? :) > Got confused by october, the tenth month. :) Tim > >> 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 >> >