From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754835Ab1ATCMJ (ORCPT ); Wed, 19 Jan 2011 21:12:09 -0500 Received: from mga03.intel.com ([143.182.124.21]:26372 "EHLO mga03.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752993Ab1ATCMH (ORCPT ); Wed, 19 Jan 2011 21:12:07 -0500 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.60,347,1291622400"; d="scan'208";a="377139115" Subject: Re: [performance bug] kernel building regression on 64 LCPUs machine From: Shaohua Li To: "Ted Ts'o" Cc: "Shi, Alex" , "czoccolo@gmail.com" , "vgoyal@redhat.com" , "jaxboe@fusionio.com" , "linux-kernel@vger.kernel.org" , "Chen, Tim C" In-Reply-To: <20110119143214.GA3043@thunk.org> References: <1295402148.4773.143.camel@debian> <20110119143214.GA3043@thunk.org> Content-Type: text/plain; charset="UTF-8" Date: Thu, 20 Jan 2011 10:12:04 +0800 Message-ID: <1295489524.1949.884.camel@sli10-conroe> Mime-Version: 1.0 X-Mailer: Evolution 2.30.3 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, 2011-01-19 at 22:32 +0800, Ted Ts'o wrote: > On Wed, Jan 19, 2011 at 09:55:48AM +0800, Alex,Shi wrote: > > Shaohua and I tested kernel building performance on latest kernel. and > > found it is drop about 15% on our 64 LCPUs NHM-EX machine on ext4 file > > system. > > What kerenl version were you comparing against? And what were you > using to benchmark this performance drop? I'm curious what your > workload was; I'm guesisng it was some kind of mixed read/write > workload? Were there any fsync()'s involved? 2.6.36 vs 2.6.37. this exists in 2.6.37-rc1. it's a kbuild, no a mixed read/write workload. kbuild hasn't fsync involved Thanks, Shaohua