From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754464Ab1ASOcV (ORCPT ); Wed, 19 Jan 2011 09:32:21 -0500 Received: from thunk.org ([69.25.196.29]:38704 "EHLO thunker.thunk.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754188Ab1ASOcU (ORCPT ); Wed, 19 Jan 2011 09:32:20 -0500 Date: Wed, 19 Jan 2011 09:32:14 -0500 From: "Ted Ts'o" To: "Alex,Shi" Cc: czoccolo@gmail.com, vgoyal@redhat.com, jaxboe@fusionio.com, "linux-kernel@vger.kernel.org" , "Li, Shaohua" , "Chen, Tim C" Subject: Re: [performance bug] kernel building regression on 64 LCPUs machine Message-ID: <20110119143214.GA3043@thunk.org> Mail-Followup-To: Ted Ts'o , "Alex,Shi" , czoccolo@gmail.com, vgoyal@redhat.com, jaxboe@fusionio.com, "linux-kernel@vger.kernel.org" , "Li, Shaohua" , "Chen, Tim C" References: <1295402148.4773.143.camel@debian> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1295402148.4773.143.camel@debian> User-Agent: Mutt/1.5.20 (2009-06-14) X-SA-Exim-Connect-IP: X-SA-Exim-Mail-From: tytso@thunk.org X-SA-Exim-Scanned: No (on thunker.thunk.org); SAEximRunCond expanded to false Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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? Thanks, regards, - Ted