From mboxrd@z Thu Jan 1 00:00:00 1970 From: Bill Davidsen Subject: Re: Big sized packets have been dropped strangly Date: Thu, 05 Jul 2007 18:01:30 -0400 Message-ID: <468D6A3A.3040101@tmr.com> References: <468B642D.9030109@alcatel-lucent.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org To: gshan Return-path: Received: from mail.tmr.com ([64.65.253.246]:34742 "EHLO gaimboi.tmr.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752883AbXGILSp (ORCPT ); Mon, 9 Jul 2007 07:18:45 -0400 In-Reply-To: <468B642D.9030109@alcatel-lucent.com> Sender: netdev-owner@vger.kernel.org List-Id: netdev.vger.kernel.org gshan wrote: > Hey Guys, > > I got a strange problem recently but no ideas, so to post the question > here. We have a FPGA what finish ATM AAL5 to ethernet frame, and CPU > receives IP packets from it. The interface based on the FPGA (called > sar0) has been bound with several IP addresses. When the MTU of the > interface is configurated to 1500, trivial packets can be received, but > big-sized packets are dropped. If the MTU is increased to 9500, > everything is ok except the NFS connection. We mounted with another > machine through sar0. When the MTU is 9500, the speed of the NFS becomes > very very slow (it almost took 10 minutes to transfer 100KB files). > > I don't know why it is and how to solve it. Any suggestions are > appreciated! > http://groups.google.com/group/fa.linux.kernel/msg/4434f7c5d38d9292 I think that's relevant. -- Bill Davidsen "We have more to fear from the bungling of the incompetent than from the machinations of the wicked." - from Slashdot