From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752325Ab1LSQaF (ORCPT ); Mon, 19 Dec 2011 11:30:05 -0500 Received: from mx3.mail.elte.hu ([157.181.1.138]:35207 "EHLO mx3.mail.elte.hu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751096Ab1LSQaB (ORCPT ); Mon, 19 Dec 2011 11:30:01 -0500 Date: Mon, 19 Dec 2011 17:28:09 +0100 From: Ingo Molnar To: Nikunj A Dadhania 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 Message-ID: <20111219162808.GB10017@elte.hu> References: <20111219083141.32311.9429.stgit@abhimanyu.in.ibm.com> <20111219112326.GA15090@elte.hu> <87k45sbxa6.fsf@abhimanyu.in.ibm.com> <8762hcbsrv.fsf@abhimanyu.in.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <8762hcbsrv.fsf@abhimanyu.in.ibm.com> User-Agent: Mutt/1.5.21 (2010-09-15) X-ELTE-SpamScore: -2.0 X-ELTE-SpamLevel: X-ELTE-SpamCheck: no X-ELTE-SpamVersion: ELTE 2.0 X-ELTE-SpamCheck-Details: score=-2.0 required=5.9 tests=BAYES_00 autolearn=no SpamAssassin version=3.3.1 -2.0 BAYES_00 BODY: Bayes spam probability is 0 to 1% [score: 0.0000] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org * Nikunj A Dadhania wrote: > 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 Btw., you could try this newfangled tools/perf/ thing to profile the kernel ;-) Thanks, Ingo