From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752901Ab2HBNAg (ORCPT ); Thu, 2 Aug 2012 09:00:36 -0400 Received: from pegase1.c-s.fr ([93.17.236.30]:39997 "EHLO mailhub1.si.c-s.fr" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751324Ab2HBNAe (ORCPT ); Thu, 2 Aug 2012 09:00:34 -0400 X-Greylist: delayed 1987 seconds by postgrey-1.27 at vger.kernel.org; Thu, 02 Aug 2012 09:00:33 EDT Message-ID: <501A722D.1070900@c-s.fr> Date: Thu, 02 Aug 2012 14:27:25 +0200 From: leroy christophe User-Agent: Mozilla/5.0 (Windows NT 5.1; rv:14.0) Gecko/20120713 Thunderbird/14.0 MIME-Version: 1.0 To: linux-kernel@vger.kernel.org Subject: Huge performance degradation for UDP between 2.4.17 and 2.6 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 ? Regards Christophe