From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753749Ab2BOR0n (ORCPT ); Wed, 15 Feb 2012 12:26:43 -0500 Received: from merlin.infradead.org ([205.233.59.134]:49278 "EHLO merlin.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753385Ab2BOR0m convert rfc822-to-8bit (ORCPT ); Wed, 15 Feb 2012 12:26:42 -0500 Message-ID: <1329326787.2293.153.camel@twins> Subject: Re: sched: Performance of Trade workload running inside VM From: Peter Zijlstra To: Srivatsa Vaddagiri Cc: mingo@elte.hu, pjt@google.com, efault@gmx.de, venki@google.com, suresh.b.siddha@intel.com, linux-kernel@vger.kernel.org, "Nikunj A. Dadhania" Date: Wed, 15 Feb 2012 18:26:27 +0100 In-Reply-To: <20120215171032.GB9918@linux.vnet.ibm.com> References: <20120214112827.GA22653@linux.vnet.ibm.com> <1329307161.2293.66.camel@twins> <20120215171032.GB9918@linux.vnet.ibm.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 On Wed, 2012-02-15 at 22:40 +0530, Srivatsa Vaddagiri wrote: > Isn't it already broken in some respect, given that > select_idle_sibling() could select a cpu which is different from > wakeup > source (thus forcing a task to run on a cpu different from wakeup > source)? select_idle_sibling() should keep it in the same cache domain, thereby reducing pain and increasing parallelism.