From mboxrd@z Thu Jan 1 00:00:00 1970 From: Rick Jones Subject: Re: degradation in bridging performance of 5% in 2.6.20 when compared to 2.6.19 Date: Fri, 16 Feb 2007 09:43:20 -0800 Message-ID: <45D5ED38.1070503@hp.com> References: <9dd3c65d0702152226h6bfc4e22q3f3b04d97d8da1fb@mail.gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Cc: netdev@vger.kernel.org To: kalyan tejaswi Return-path: Received: from palrel12.hp.com ([156.153.255.237]:59305 "EHLO palrel12.hp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932621AbXBPRnY (ORCPT ); Fri, 16 Feb 2007 12:43:24 -0500 In-Reply-To: <9dd3c65d0702152226h6bfc4e22q3f3b04d97d8da1fb@mail.gmail.com> Sender: netdev-owner@vger.kernel.org List-Id: netdev.vger.kernel.org kalyan tejaswi wrote: > Hi all, > I have been comparing bridging performance for 2.6.20 and 2.6.19 > kernels. The kenel configurations are identical for both the kernels. > I use D-Link cards (8139too driver) for the Malta 4Kc board. > > The setup is: > > netperf client <-------> malta 4Kc <---------> netperf server. > > The throughput statistics (in 10^6 bits/second) are: > > 2.6.19 2.6.20 > routing 30.2 30.16 > bridging 32.35 30.81 > > I observe that there has been a degradation in bridging performance of > 5% in 2.6.20 when compared to 2.6.19. > > Has anyone observed similar behaviour? > Any inputs or suggestions are welcome. In each case is the malta CPU bound? If not, some idea of the change in CPU util might be helpful. rick jones btw, netperf 2.4.3 just released: ftp://ftp.netperf.org/netperf http://www.netperf.org/svn/netperf2/tags/netperf-2.4.3