Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753868Ab2FEQCo (ORCPT ); Tue, 5 Jun 2012 12:02:44 -0400 Received: from mga03.intel.com ([143.182.124.21]:48002 "EHLO mga03.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753599Ab2FEQCm convert rfc822-to-8bit (ORCPT ); Tue, 5 Jun 2012 12:02:42 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.71,315,1320652800"; d="scan'208";a="108105139" From: "Yu, Fenghua" To: Peter Zijlstra , Rusty Russell CC: Thomas Gleixner , Ingo Molnar , H Peter Anvin , "Siddha, Suresh B" , "Luck, Tony" , "Mallick, Asit K" , Arjan Dan De Ven , linux-kernel , x86 , linux-pm , "Srivatsa S. Bhat" Subject: RE: [PATCH 0/6] x86/cpu hotplug: Wake up offline CPU via mwait or nmi Thread-Topic: [PATCH 0/6] x86/cpu hotplug: Wake up offline CPU via mwait or nmi Thread-Index: AQHNQoAPrrSeWa27GkKpGKrFiBcRb5brDNOAgAAGFYCAAEURgIAAdQ+AgAAVOjA= Date: Tue, 5 Jun 2012 16:02:03 +0000 Message-ID: <3E5A0FA7E9CA944F9D5414FEC6C7122007727023@ORSMSX105.amr.corp.intel.com> References: <1338833876-29721-1-git-send-email-fenghua.yu@intel.com> <1338842001.28282.135.camel@twins> <87zk8iioam.fsf@rustcorp.com.au> <1338881971.28282.150.camel@twins> In-Reply-To: <1338881971.28282.150.camel@twins> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.22.254.140] Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 8BIT MIME-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1175 Lines: 28 > -----Original Message----- > From: Peter Zijlstra [mailto:peterz@infradead.org] > Sent: Tuesday, June 05, 2012 12:40 AM > To: Rusty Russell > Cc: Thomas Gleixner; Yu, Fenghua; Ingo Molnar; H Peter Anvin; Siddha, > Suresh B; Luck, Tony; Mallick, Asit K; Arjan Dan De Ven; linux-kernel; > x86; linux-pm; Srivatsa S. Bhat > Subject: Re: [PATCH 0/6] x86/cpu hotplug: Wake up offline CPU via mwait > or nmi > > On Tue, 2012-06-05 at 10:10 +0930, Rusty Russell wrote: > > I disagree. Deactivating a cpu for power saving is halfway to > hotplug > > anyway. > > No, that's only so for broken hardware. On sane hardware idling is > sufficient. Users can consolidate processes on a few online CPU's and offline the rest when workload is light. This consolidation can save more power and have better performance than idling CPU's because hot cache in online CPU's and offline CPU's can be allocated in same package. Thanks. -Fenghua -- 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/