Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753431AbaFHH5E (ORCPT ); Sun, 8 Jun 2014 03:57:04 -0400 Received: from mga03.intel.com ([143.182.124.21]:27253 "EHLO mga03.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753333AbaFHH5D (ORCPT ); Sun, 8 Jun 2014 03:57:03 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.98,997,1392192000"; d="scan'208";a="442763538" Date: Sun, 8 Jun 2014 07:53:07 +0800 From: Yuyang Du To: Ingo Molnar Cc: Peter Zijlstra , Dirk Brandewie , "Rafael J. Wysocki" , Morten Rasmussen , "linux-kernel@vger.kernel.org" , "linux-pm@vger.kernel.org" , "vincent.guittot@linaro.org" , "daniel.lezcano@linaro.org" , "preeti@linux.vnet.ibm.com" , Dietmar Eggemann , len.brown@intel.com, jacob.jun.pan@linux.intel.com Subject: Re: [RFC PATCH 06/16] arm: topology: Define TC2 sched energy and provide it to scheduler Message-ID: <20140607235307.GD22261@intel.com> References: <20140604160230.GS29593@e103034-lin> <20140604172712.GJ13930@laptop.programming.kicks-ass.net> <2484761.vkWavnsDx3@vostro.rjw.lan> <20140605065205.GA3213@twins.programming.kicks-ass.net> <539086B3.2010804@gmail.com> <20140605202930.GA15484@intel.com> <20140606080543.GR6758@twins.programming.kicks-ass.net> <20140606003520.GB22261@intel.com> <20140606105036.GQ3213@twins.programming.kicks-ass.net> <20140606121305.GA8571@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20140606121305.GA8571@gmail.com> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Jun 06, 2014 at 02:13:05PM +0200, Ingo Molnar wrote: > > Leakage current typically gets higher with higher frequencies, but > it's also highly process dependent AFAIK. > In general, you can assume leakage power ~ V^2. > If switching power dissipation is the main factor in power use, then > we can essentially assume that P ~ V^2, at the same frequency - and > scales linearly with frequency - but real work performed also scales > semi-linearly with frequency for many workloads, so that's an > invariant for everything except highly memory bound workloads. > Agreed. Strictly, Energy ~ V^2. -- 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/