From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754532Ab2CZIgJ (ORCPT ); Mon, 26 Mar 2012 04:36:09 -0400 Received: from merlin.infradead.org ([205.233.59.134]:57323 "EHLO merlin.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753574Ab2CZIgI convert rfc822-to-8bit (ORCPT ); Mon, 26 Mar 2012 04:36:08 -0400 Message-ID: <1332750960.16159.81.camel@twins> Subject: Re: sched: Avoid SMT siblings in select_idle_sibling() if possible From: Peter Zijlstra To: Srivatsa Vaddagiri Cc: Ingo Molnar , Mike Galbraith , Suresh Siddha , linux-kernel , Paul Turner Date: Mon, 26 Mar 2012 10:36:00 +0200 In-Reply-To: <20120322153205.GA28570@linux.vnet.ibm.com> References: <1329764866.2293.376.camhel@twins> <20120305152443.GE26559@linux.vnet.ibm.com> <20120306091410.GD27238@elte.hu> <20120322153205.GA28570@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 Thu, 2012-03-22 at 21:02 +0530, Srivatsa Vaddagiri wrote: > > Now the more interesting VM scenario: > More interesting for whoem? I still think virt is an utter waste of time ;-) > tip tip + patch > > volano 1 1.29 (29% improvement) > sysbench [n3] 1 2 (100% improvement) > tbench 1 [n4] 1 1.07 (7% improvement) > tbench 8 [n5] 1 1.26 (26% improvement) > httperf [n6] 1 1.05 (5% improvement) > Trade 1 1.31 (31% improvement) That smells like there's more to the story, a 100% improvement is too much..