From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751884Ab2HCFN2 (ORCPT ); Fri, 3 Aug 2012 01:13:28 -0400 Received: from exprod7og110.obsmtp.com ([64.18.2.173]:35007 "EHLO exprod7og110.obsmtp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750750Ab2HCFN0 (ORCPT ); Fri, 3 Aug 2012 01:13:26 -0400 Message-ID: <501B5DAC.7070400@genband.com> Date: Thu, 02 Aug 2012 23:12:12 -0600 From: Chris Friesen User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.24) Gecko/20111108 Fedora/3.1.16-1.fc14 Lightning/1.0b3pre Thunderbird/3.1.16 MIME-Version: 1.0 To: leroy christophe CC: linux-kernel@vger.kernel.org Subject: Re: Huge performance degradation for UDP between 2.4.17 and 2.6 References: <501A722D.1070900@c-s.fr> In-Reply-To: <501A722D.1070900@c-s.fr> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-OriginalArrivalTime: 03 Aug 2012 05:12:13.0523 (UTC) FILETIME=[8AD88230:01CD7136] X-TM-AS-Product-Ver: SMEX-8.0.0.4160-6.500.1024-19082.002 X-TM-AS-Result: No--4.784500-8.000000-31 X-TM-AS-User-Approved-Sender: No X-TM-AS-User-Blocked-Sender: No Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 08/02/2012 06:27 AM, leroy christophe wrote: > Hi > > I'm having a big issue with UDP. Using a powerpc board (MPC860). > > With our board running kernel 2.4.17, I'm able to send 160000 voice > packets (UDP, 96 bytes per packet) in 11 seconds. > With the same board running either Kernel 2.6.35.14 or Kernel 3.4.7, I > need 55 seconds to send the same amount of packets. > > > Is there anything to tune in order to get same output rate as with > Kernel 2.4 ? Have you tried profiling it to see where the time is being spent? Also turning off any unnecessary features, debugging, etc? Chris