From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753333AbYJTMj0 (ORCPT ); Mon, 20 Oct 2008 08:39:26 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751518AbYJTMjS (ORCPT ); Mon, 20 Oct 2008 08:39:18 -0400 Received: from ns0.motion-twin.com ([213.186.50.39]:46458 "EHLO mail.motion-twin.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751056AbYJTMjS (ORCPT ); Mon, 20 Oct 2008 08:39:18 -0400 Message-ID: <48FC7BEE.1020701@motion-twin.com> Date: Mon, 20 Oct 2008 14:39:10 +0200 From: Nicolas Cannasse User-Agent: Thunderbird 2.0.0.17 (Windows/20080914) MIME-Version: 1.0 To: swivel@shells.gnugeneration.com CC: linux-kernel@vger.kernel.org Subject: Re: poll() blocked / packets not received ? References: <48FC4066.9060303@motion-twin.com> <20081020101549.GH2811@fc6222126.aspadmin.net> <48FC61A0.7010003@motion-twin.com> <20081020113942.GJ2811@fc6222126.aspadmin.net> In-Reply-To: <20081020113942.GJ2811@fc6222126.aspadmin.net> 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 > TCP being reliable can block indefinitely, you can employ TCP keepalive > to change indefinite to quite a long time. Ok, funny thing is that we just found what is occurring... We had a process that was on a regular basis doing the following : conntrack -F This was done in order to prevent the table to grow too big, because we were reaching the maximum size as told by : /proc/sys/net/ipv4/netfilter/ip_conntrack_max and /proc/sys/net/ipv4/netfilter/ip_conntrack_count Seems like when there are active connections, this will break netfilter and stop delivering packets to the socket. At least I will have nice sleep tonight. Best, Nicolas