Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754871AbZCEWic (ORCPT ); Thu, 5 Mar 2009 17:38:32 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753566AbZCEWiX (ORCPT ); Thu, 5 Mar 2009 17:38:23 -0500 Received: from mga01.intel.com ([192.55.52.88]:57862 "EHLO mga01.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753162AbZCEWiX convert rfc822-to-8bit (ORCPT ); Thu, 5 Mar 2009 17:38:23 -0500 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.38,309,1233561600"; d="scan'208";a="670715259" From: "Brandeburg, Jesse" To: Maurice Volaski , "linux-kernel@vger.kernel.org" CC: "Kirsher, Jeffrey T" Date: Thu, 5 Mar 2009 14:38:13 -0800 Subject: RE: e1000 is subtly incompatible with jumbo frames Thread-Topic: e1000 is subtly incompatible with jumbo frames Thread-Index: Acmd3/YFjEAc/yCKQ6KEQPmhERTXBAAAu9LQ Message-ID: References: In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: acceptlanguage: en-US Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 8BIT MIME-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1077 Lines: 23 Maurice Volaski wrote: > I have a system using the e1000 driver with the MTU set to 9000. If I > try FTP to get a file, the transfer does not start. Something about > the 9000 MTU is preventing the NIC from receiving packets back from > the FTP server. (The FTP server is on the same subnet and its NIC > also has MTU 9000.) The 9000 MTU NIC works fine in every other > respect, even allowing me to access the system via ssh. When I change > the MTU to 1500, then FTP works fine. The problem is common to > numerous kernel versions including 2.6.24 through 2.6.29-rc5. This sounds like you have not configured the MTU the same on both ends or some station in between is having issues with the large packets please double check your configuration. we also need to know kernel version, driver version, lspci output Thanks, Jesse-- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/