Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755360Ab3DLQsq (ORCPT ); Fri, 12 Apr 2013 12:48:46 -0400 Received: from mout.gmx.net ([212.227.15.15]:50408 "EHLO mout.gmx.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751440Ab3DLQso (ORCPT ); Fri, 12 Apr 2013 12:48:44 -0400 X-Authenticated: #14349625 X-Provags-ID: V01U2FsdGVkX187hQxlUac7hXradIKm7llPjwDe/SRmPwFe+/9Pnj 2lAM+mLRJmpQ+4 Message-ID: <1365785311.5814.36.camel@marge.simpson.net> Subject: Re: [patch v7 0/21] sched: power aware scheduling From: Mike Galbraith 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 Date: Fri, 12 Apr 2013 18:48:31 +0200 In-Reply-To: <20130412162348.GE2368@pd.tnic> References: <1365040862-8390-1-git-send-email-alex.shi@intel.com> <516724F5.20504@kernel.org> <5167C9FA.8050406@intel.com> <20130412162348.GE2368@pd.tnic> Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.2.3 Content-Transfer-Encoding: 7bit Mime-Version: 1.0 X-Y-GMX-Trusted: 0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1038 Lines: 26 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/