From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1764414AbXEST3V (ORCPT ); Sat, 19 May 2007 15:29:21 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1759275AbXEST3M (ORCPT ); Sat, 19 May 2007 15:29:12 -0400 Received: from gw1.cosmosbay.com ([86.65.150.130]:55982 "EHLO gw1.cosmosbay.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755016AbXEST3K (ORCPT ); Sat, 19 May 2007 15:29:10 -0400 Message-ID: <464F4FD7.80303@cosmosbay.com> Date: Sat, 19 May 2007 21:28:23 +0200 From: Eric Dumazet User-Agent: Thunderbird 1.5.0.10 (Windows/20070221) MIME-Version: 1.0 To: Vasantha Kumar Puttappa CC: linux-kernel@vger.kernel.org, Linux Netdev List Subject: Re: Packets lost: Softirq References: <3388.10.107.26.27.1179320821.squirrel@gpo.iitb.ac.in> <464B19A9.700@freemail.hu> <2770.10.107.26.27.1179579009.squirrel@gpo.iitb.ac.in> In-Reply-To: <2770.10.107.26.27.1179579009.squirrel@gpo.iitb.ac.in> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 8bit X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-1.6 (gw1.cosmosbay.com [86.65.150.130]); Sat, 19 May 2007 21:28:29 +0200 (CEST) Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Vasantha Kumar Puttappa a écrit : > Hi All, > Please somebody guide me here. I desparatley need help regarding this > issue. ( plz do "reply to all") > > I am tracking all udp packets (in particular, SIP based UDP packets)that > goes through the iptables using LOG mechanism. > I use the following command, > iptables -A INPUT -p udp -j LOG --log-level-4. > iptables -A FORWARD -p udp -j LOG --log-level-4 > > In addition, i also run 'Ethereal' to make sure that all the packets > captured goes through the iptables as well. > > Here is the problem, > Sometimes, a random number of packets doesnot go through IPtables and > they are completely lost. Although, I can see those lost packets in > Ethereal. I tried increasing the backlog queue and ip_queue length, but > still no use. > > I am using Netgear's wireless network card (WG511, made in taiwan). > Device driver: Prism54 > firmware: isl3890 > Kernel verison-- 2.6.11-6mdk > > Let me give you more insight into what I am trying do. > > I have a vitrual network interface and 2 physical network interface (one > Ethernet based, and other 802.11 based). The virtual network interface > dynamically binds to any one of the above physical interfaces for packet > transmission. The issue of packet loss occurs **only** during link > switching. > > I feel that the following issues might be the possible reasons for the > packet loss. > > 1. Due to missing soft_IRQ interrupt for packets and hence packet loss ( i > have no proof to back this) > 2. Due to incompatible wireless device driver. > netdev CCed 3) packets are going normally through iptables, but the '-j LOG' is flooded and syslog miss some of them. Just do a : iptables -nvL INPUT and check packets counters : they should match ethereal ones :) -j LOG is not designed for logging all packets, just some of them :)