Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753635AbYAWPyj (ORCPT ); Wed, 23 Jan 2008 10:54:39 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751700AbYAWPyc (ORCPT ); Wed, 23 Jan 2008 10:54:32 -0500 Received: from waste.org ([66.93.16.53]:34886 "EHLO waste.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751536AbYAWPyc (ORCPT ); Wed, 23 Jan 2008 10:54:32 -0500 Subject: Re: Rescheduling interrupts From: Matt Mackall To: Andi Kleen Cc: Ingo Molnar , =?UTF-8?Q?S=2E=C3=87a=C4=9Flar?= Onur , LKML , Arjan van de Ven In-Reply-To: References: <200801220119.42312.caglar@pardus.org.tr> <200801221455.16814.caglar@pardus.org.tr> <20080122152333.GB19590@elte.hu> <200801221755.56470.caglar@pardus.org.tr> <20080122160557.GA31831@elte.hu> <1201021429.14436.45.camel@cinder.waste.org> <20080122192744.GB3218@elte.hu> Content-Type: text/plain Date: Wed, 23 Jan 2008 09:52:36 -0600 Message-Id: <1201103556.14436.109.camel@cinder.waste.org> Mime-Version: 1.0 X-Mailer: Evolution 2.12.2 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1197 Lines: 28 On Wed, 2008-01-23 at 09:53 +0100, Andi Kleen wrote: > Ingo Molnar writes: > > > that would probably be the case if it's multiple sockets - but for > > multiple cores exactly the opposite is true: the sooner _both_ cores > > finish processing, the deeper power use the CPU can reach. > > That's only true on setups where the cores don't have > separate sleep states. But that's not generally true anymore. > e.g. AMD Fam10h has completely separate power planes for > the cores and I believe newer Intel CPUs can also let their > cores go to at least some sleep states independently (although > the deepest sleep modi still require all cores idle) I think we can expect everyone to rapidly evolve towards full independence of core power states. In fact, it wouldn't surprise me if we eventually get to the point of shutting down individual functional units like the FPU. -- Mathematics is the supreme nostalgia of our time. -- 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/