From mboxrd@z Thu Jan 1 00:00:00 1970 From: Mike Galbraith Subject: Re: [patch v7 0/21] sched: power aware scheduling Date: Fri, 12 Apr 2013 18:48:31 +0200 Message-ID: <1365785311.5814.36.camel@marge.simpson.net> References: <1365040862-8390-1-git-send-email-alex.shi@intel.com> <516724F5.20504@kernel.org> <5167C9FA.8050406@intel.com> <20130412162348.GE2368@pd.tnic> Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit Return-path: Received: from mout.gmx.net ([212.227.15.18]:53858 "EHLO mout.gmx.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751183Ab3DLQso (ORCPT ); Fri, 12 Apr 2013 12:48:44 -0400 Received: from mailout-de.gmx.net ([10.1.76.1]) by mrigmx.server.lan (mrigmx001) with ESMTP (Nemesis) id 0Md1TA-1U9iET0O3e-00IC2T for ; Fri, 12 Apr 2013 18:48:43 +0200 In-Reply-To: <20130412162348.GE2368@pd.tnic> Sender: linux-pm-owner@vger.kernel.org List-Id: linux-pm@vger.kernel.org To: Borislav Petkov Cc: Alex Shi , Len Brown , mingo@redhat.com, peterz@infradead.org, tglx@linutronix.de, akpm@linux-foundation.org, arjan@linux.intel.com, pjt@google.com, namhyung@kernel.org, morten.rasmussen@arm.com, vincent.guittot@linaro.org, gregkh@linuxfoundation.org, preeti@linux.vnet.ibm.com, viresh.kumar@linaro.org, linux-kernel@vger.kernel.org, len.brown@intel.com, rafael.j.wysocki@intel.com, jkosina@suse.cz, clark.williams@gmail.com, tony.luck@intel.com, keescook@chromium.org, mgorman@suse.de, riel@redhat.com, Linux PM list On Fri, 2013-04-12 at 18:23 +0200, Borislav Petkov wrote: > On Fri, Apr 12, 2013 at 04:46:50PM +0800, Alex Shi wrote: > > Thanks a lot for comments, Len! > > AFAICT, you kinda forgot to answer his most important question: > > > These numbers suggest that this patch series simultaneously > > has a negative impact on performance and energy required > > to retire the workload. Why do it? Hm. When I tested AIM7 compute on a NUMA box, there was a marked throughput increase at the low to moderate load end of the test spectrum IIRC. Fully repeatable. There were also other benefits unrelated to power, ie mitigation of the evil face of select_idle_sibling(). I rather liked what I saw during ~big box test-drive. (just saying there are other aspects besides joules in there) -Mike