From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752947Ab2GETzy (ORCPT ); Thu, 5 Jul 2012 15:55:54 -0400 Received: from mail.snarked.org ([67.43.172.250]:60298 "EHLO mail.snarked.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752213Ab2GETzc (ORCPT ); Thu, 5 Jul 2012 15:55:32 -0400 X-Envelope-From: (mail.snarked.org) To: linux-kernel@vger.kernel.org From: "D. Stussy" Newsgroups: linux.kernel Subject: Re: Intel e1000 ethernet device, change in kernel v3.4, and jumbo frames setting DENIED. Date: Thu, 5 Jul 2012 12:55:31 -0700 Message-ID: References: Reply-To: "D. Stussy" Mime-Version: 1.0 Content-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=original Content-Transfer-Encoding: 7bit X-No-Archive: Yes X-MimeOLE: Produced By Microsoft MimeOLE V15.4.3555.308 In-Reply-To: X-Newsreader: Microsoft Windows Live Mail 15.4.3555.308 Importance: Normal X-Priority: 3 X-MSMail-Priority: Normal Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org "Henrique de Moraes Holschuh" wrote in message news:jjGoO-7l0-19@gated-at.bofh.it... On Wed, 04 Jul 2012, D. Stussy wrote: > There has been some changes to the driver such that things like > checksum verification is offloaded from the CPU. However, this > blocks the ability to set a jumbo frame. The kernel does record an > error indicating that checksum offloading need be disabled fro jumbo > frame MTU sizes to be used. My e1000 interfaces use the 82574L > chipset. > > 1) Was this an intentional change? Yes, but I understand Intel is trying to come up with a way not to need it. > 2) How do I disable that function so I can set jumbo frames with > "ifconfig" or "ip"? I simply don't know what setting I need to > pass. ethtool can do it. Check its manpage, it can manipulate the various NIC offload engines, as well as other parameters such as dma ring buffer size, etc. ===================== I'll look into it. Thanks.