Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753852Ab2FEQJs (ORCPT ); Tue, 5 Jun 2012 12:09:48 -0400 Received: from casper.infradead.org ([85.118.1.10]:48669 "EHLO casper.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751327Ab2FEQJq convert rfc822-to-8bit (ORCPT ); Tue, 5 Jun 2012 12:09:46 -0400 Message-ID: <1338912565.2749.9.camel@twins> Subject: RE: [PATCH 0/6] x86/cpu hotplug: Wake up offline CPU via mwait or nmi From: Peter Zijlstra To: "Yu, Fenghua" Cc: Rusty Russell , 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" Date: Tue, 05 Jun 2012 18:09:25 +0200 In-Reply-To: <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> <3E5A0FA7E9CA944F9D5414FEC6C7122007727023@ORSMSX105.amr.corp.intel.com> Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7BIT X-Mailer: Evolution 3.2.2- Mime-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 676 Lines: 17 On Tue, 2012-06-05 at 16:02 +0000, Yu, Fenghua wrote: > > Users can consolidate processes on a few online CPU's and offline the > rest when workload is light. No they can't, hotplug is a root only op. > 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. Yeah, or you fix the load-balancer to do this. -- 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/