From mboxrd@z Thu Jan 1 00:00:00 1970 From: Peter Zijlstra Subject: Re: cpuidle asymmetry (was Re: [RFC PATCH V4 5/5] cpuidle: cpuidle driver for apm) Date: Thu, 31 Mar 2011 15:18:56 +0200 Message-ID: <1301577536.4859.249.camel@twins> 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> Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Return-path: In-Reply-To: List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xensource.com Errors-To: xen-devel-bounces@lists.xensource.com To: Len Brown Cc: Stephen Rothwell , ak@linux.intel.com, suresh.b.siddha@intel.com, venki@google.com, benh@kernel.crashing.org, linux-kernel@vger.kernel.org, xen-devel@lists.xensource.com, Vaidyanathan Srinivasan , arjan@linux.intel.com, Trinabh Gupta List-Id: xen-devel@lists.xenproject.org On Wed, 2011-03-30 at 22:17 -0400, Len Brown wrote: >=20 > 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.=20 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?