Received: by 2002:a05:6a10:22f:0:0:0:0 with SMTP id 15csp459325pxk; Thu, 24 Sep 2020 09:39:28 -0700 (PDT) X-Google-Smtp-Source: ABdhPJyB022rKh/K9P0DIX0SW73nTeCYVOl0xco5yHk6uUhT9EDv0FucCKapWKevEX6F4aCjMN2I X-Received: by 2002:a17:906:30c7:: with SMTP id b7mr793697ejb.7.1600965568279; Thu, 24 Sep 2020 09:39:28 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1600965568; cv=none; d=google.com; s=arc-20160816; b=oHp0bA4PZW8vzpawcMuuCMTZIpNe+NWh0HjZqWY6fi62evsbbT744pA6XnZ1wDUTY2 77aF/TeYvLpXcxybkZYVcWzQ8RxVzuuwH/JLWaKEebB961lNEt6AOLlCYvKej+gh6G3q 1603ou4bJVcm1+kxFTyZR2OBw/E2w+BWHk6mHPNKVYMshjYblqUY9C/3ZOnIIEZqGFFY BIxGU2JKq1wCWyTnBcV9a4fQUbGbxzdmkhsFGXQIJGbIg/ESUy0BjtIdQRdxTDuXt81g NXRT38BA7tSI0IRe84OOhSjywlm2c8HZmjVv+1wDTY9HUGwmP5q3aYlwi6EoTGLtPoq2 odFA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:content-transfer-encoding:content-language :in-reply-to:mime-version:user-agent:date:message-id:from:references :cc:to:subject:ironport-sdr:ironport-sdr; bh=rucAQIg095gfMekIXowYMmfhykHHuhiu6cJvCcZidK0=; b=hq+eWzh6vk1nEfhSpjbO+WThCy26x2BgBC29L8+LsYygpQ5cabDLWM5tZBkEMLuS6w N2ThQNV/gFQ9QCMg94tOWCa2VwZM1UL1AT6jzaS4rxU/BvXYS4LdOUPxzGFpq8CouqgW 9PvaGPjTSwuhBOJ3zPDKyN9V4/SaNlFz0tRegekcd8U9a0xGAaEz0tUZiNWR5uZmbd/a tmeL8JkbY46AzNfN69iHb87MtEEasxcXTtD0vtYpLlH9ZbzYlGq6qvpZXuTmP7cc5+GY lLU+iJ45lmsjp8tE2YAQjA9+ozjR26zbePMIhjO/rM4ZxkQ4CiqP9E3CBJtgtcbpjVhz 2Lfw== ARC-Authentication-Results: i=1; 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 Return-Path: Received: from vger.kernel.org (vger.kernel.org. [23.128.96.18]) by mx.google.com with ESMTP id g11si2611147eds.232.2020.09.24.09.39.05; Thu, 24 Sep 2020 09:39:28 -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 S1727153AbgIXQho (ORCPT + 99 others); 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