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=-5.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS 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 CBB41C4363D for ; Thu, 24 Sep 2020 17:13:52 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 614D8238A1 for ; Thu, 24 Sep 2020 17:13:52 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="Piprq4iM" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728589AbgIXRNv (ORCPT ); Thu, 24 Sep 2020 13:13:51 -0400 Received: from us-smtp-delivery-124.mimecast.com ([63.128.21.124]:29911 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727136AbgIXRNv (ORCPT ); Thu, 24 Sep 2020 13:13:51 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1600967629; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=12L9VeJpf7N5GiUvawNcQLZPZYtJc7Q5WG3UX7MsT7M=; b=Piprq4iMeCw8lXRzPa53y2uk3V804qOiT4LMCqhecIVUjfHn3OHUWS8bI2i3Of4DHF5VbZ rOVNoB72xxaumjvwDCH6nvt3ay6R6IplVXOFcegzRL68o0EKjAvsNcoxgujpVJjZKZrrxE aWO+tFy8sBtmyGvUibQDykgJ0smhrow= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-426-Lt4dIp6PPcSxxn3JMnPMuA-1; Thu, 24 Sep 2020 13:13:48 -0400 X-MC-Unique: Lt4dIp6PPcSxxn3JMnPMuA-1 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id C798618C89C4; Thu, 24 Sep 2020 17:13:45 +0000 (UTC) Received: from lorien.usersys.redhat.com (ovpn-112-166.phx2.redhat.com [10.3.112.166]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 42A7978828; Thu, 24 Sep 2020 17:13:41 +0000 (UTC) Date: Thu, 24 Sep 2020 13:13:39 -0400 From: Phil Auld To: Tim Chen 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 Subject: Re: [RFC PATCH v2] sched/fair: select idle cpu from idle cpumask in sched domain Message-ID: <20200924171339.GD29958@lorien.usersys.redhat.com> 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> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <40ee756f-1f27-b17e-6292-d8069a56e3c8@linux.intel.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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? :) > 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 > --