From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752863Ab1LSNVU (ORCPT ); Mon, 19 Dec 2011 08:21:20 -0500 Received: from e28smtp05.in.ibm.com ([122.248.162.5]:36738 "EHLO e28smtp05.in.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752435Ab1LSNVS (ORCPT ); Mon, 19 Dec 2011 08:21:18 -0500 From: Nikunj A Dadhania To: Ingo Molnar Cc: peterz@infradead.org, linux-kernel@vger.kernel.org, vatsa@linux.vnet.ibm.com, bharata@linux.vnet.ibm.com Subject: Re: [RFC PATCH 0/4] Gang scheduling in CFS In-Reply-To: <87k45sbxa6.fsf@abhimanyu.in.ibm.com> References: <20111219083141.32311.9429.stgit@abhimanyu.in.ibm.com> <20111219112326.GA15090@elte.hu> <87k45sbxa6.fsf@abhimanyu.in.ibm.com> User-Agent: Notmuch/0.10.2+70~gf0e0053 (http://notmuchmail.org) Emacs/23.3.1 (x86_64-redhat-linux-gnu) Date: Mon, 19 Dec 2011 18:52:28 +0530 Message-ID: <8762hcbsrv.fsf@abhimanyu.in.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii x-cbid: 11121913-8256-0000-0000-0000008C89E1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, 19 Dec 2011 17:15:05 +0530, Nikunj A Dadhania wrote: > > > > What's behind this huge speedup? Does ebizzy use user-space > > spinlocks perhaps? Could we do something on the user-space side > > to get a similar speedup? > > > Some more oprofile data here for the above ebizzy-2VM run: > That is readprofile data, kernel booted with profile=2 Nikunj