From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752644AbYLRTvI (ORCPT ); Thu, 18 Dec 2008 14:51:08 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751521AbYLRTuu (ORCPT ); Thu, 18 Dec 2008 14:50:50 -0500 Received: from wa-out-1112.google.com ([209.85.146.183]:7909 "EHLO wa-out-1112.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751568AbYLRTut (ORCPT ); Thu, 18 Dec 2008 14:50:49 -0500 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:to:subject:mime-version:content-type :content-transfer-encoding:content-disposition; b=cI6G3mfsoQeT5bC2qi9o6vtW22qu4CtG/iP+pLcg0mlbjcsWOiRFBOyi4Eb//efkc3 h1+BH679vlNAkvmpFmXRNs9B6VNstqlva5NzetPw/+MJh5NoALFyuc+afzsnYqIJ/i7t j8TejJkZ8OVFzhz/JQQl4k2T9vwZDsyyKXB0k= Message-ID: <3bedf6ab0812181150hb94e007gae8950b9b8a2c1a7@mail.gmail.com> Date: Fri, 19 Dec 2008 01:20:48 +0530 From: "karthikeyan S" To: linux-kernel@vger.kernel.org, netdev@vger.kernel.org Subject: packets dropped after send returns success MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Content-Disposition: inline Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi, I am facing an issue with a linux box (a wireless lan controller), would like to have suggestions from you. The controller sends a mobility udp ping request to it's mobility members every 30 seconds upon receiving a ping request. These ping responses are dropped randomly for unknown reasons (it runs fine for 3-4 days then it experiences this problem for say 20 minutes then resumes to normalcy) This issue happens at the customer site and we haven't been able to reproduce it in-house. The mobility application sends the packet to the kernel using sendmsg() and it returns success.What may be the possible reasons for packets being dropped in kernel after sendmsg() returns success? I don't think there are any routing issues. One possible reason that I thought of is that the driver transmit queue is full. But looks like other type of packets are going out of controller. Could you plese provide your input? (kernel version is 2.4) Thanks a lot. -karthik