From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1763446AbYEGHE3 (ORCPT ); Wed, 7 May 2008 03:04:29 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1756718AbYEGHET (ORCPT ); Wed, 7 May 2008 03:04:19 -0400 Received: from smtp1.linux-foundation.org ([140.211.169.13]:40132 "EHLO smtp1.linux-foundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755717AbYEGHES (ORCPT ); Wed, 7 May 2008 03:04:18 -0400 Date: Wed, 7 May 2008 00:04:09 -0700 From: Andrew Morton To: "Zhang, Yanmin" Cc: Peter Zijlstra , LKML Subject: Re: volanoMark regression with kernel 2.6.26-rc1 Message-Id: <20080507000409.4ecc7d30.akpm@linux-foundation.org> In-Reply-To: <1210039590.3453.18.camel@ymzhang> References: <1210039590.3453.18.camel@ymzhang> X-Mailer: Sylpheed 2.4.8 (GTK+ 2.12.5; x86_64-redhat-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, 06 May 2008 10:06:30 +0800 "Zhang, Yanmin" wrote: > Comparing with 2.6.25, volanoMark has big regression with kernel 2.6.26-rc1. > It's about 50% on my 8-core stoakley, 16-core tigerton, and Itanium Montecito. > > With bisect, I located below patch. > > 18d95a2832c1392a2d63227a7a6d433cb9f2037e is first bad commit > commit 18d95a2832c1392a2d63227a7a6d433cb9f2037e > Author: Peter Zijlstra > Date: Sat Apr 19 19:45:00 2008 +0200 The merge window strikes again? > > sched: fair-group: SMP-nice for group scheduling > > Implement SMP nice support for the full group hierarchy. > > If I reverse the patch with resolving some conflictions, volanoMark result could > be restored completely. > > ___ > AIM7 (use tmpfs) also has ___more than 40% on my 8-core stoakley, 16-core tigerton, > and Itanium Montecito, but I verified that aim7 regression isn't caused by above > patch. I am doing new bisect to check aim7 now. >