Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757594Ab1CaNUH (ORCPT ); Thu, 31 Mar 2011 09:20:07 -0400 Received: from casper.infradead.org ([85.118.1.10]:38796 "EHLO casper.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752643Ab1CaNUE convert rfc822-to-8bit (ORCPT ); Thu, 31 Mar 2011 09:20:04 -0400 Subject: Re: cpuidle asymmetry (was Re: [RFC PATCH V4 5/5] cpuidle: cpuidle driver for apm) From: Peter Zijlstra To: Len Brown Cc: Vaidyanathan Srinivasan , Trinabh Gupta , arjan@linux.intel.com, Stephen Rothwell , suresh.b.siddha@intel.com, benh@kernel.crashing.org, venki@google.com, ak@linux.intel.com, linux-kernel@vger.kernel.org, xen-devel@lists.xensource.com In-Reply-To: References: <20110322123208.28725.30945.stgit@tringupt.in.ibm.com> <20110322123336.28725.29810.stgit@tringupt.in.ibm.com> <20110323121458.ec7cdaf9.sfr@canb.auug.org.au> <4D89CA7D.8080108@linux.vnet.ibm.com> <4D8B550D.5000409@linux.vnet.ibm.com> <20110325180156.GC19214@dirshya.in.ibm.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 8BIT Date: Thu, 31 Mar 2011 15:18:56 +0200 Message-ID: <1301577536.4859.249.camel@twins> Mime-Version: 1.0 X-Mailer: Evolution 2.30.3 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 618 Lines: 13 On Wed, 2011-03-30 at 22:17 -0400, Len Brown wrote: > > Moorestown is already an example of an asymmetric system, > since its deepest c-state is available on cpu0, but not on cpu1. > So it needs different tables for each cpu. wtf are these hardware guys smoking and how the heck are we supposed to schedule on such a machine? Prefer to keep cpu1 busy while idling cpu0? -- 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/