From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Kok, Auke" Subject: Re: e1000 driver problems Date: Tue, 04 Dec 2007 09:19:11 -0800 Message-ID: <47558C0F.9000708@intel.com> References: <20071127150700.GB4365@ics.muni.cz> <474C4A74.90705@intel.com> <20071127173146.GG4365@ics.muni.cz> <474C5678.3060609@intel.com> <20071127174456.GH4365@ics.muni.cz> <474C6084.9000301@intel.com> <20071203095023.GG26573@ics.muni.cz> <47541ED0.9090808@intel.com> <20071204153405.GG8704@ics.muni.cz> <20071204170827.GH8704@ics.muni.cz> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Cc: Matt Mathis , NetDev To: Lukas Hejtmanek Return-path: Received: from mga09.intel.com ([134.134.136.24]:59888 "EHLO mga09.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751075AbXLDRTw (ORCPT ); Tue, 4 Dec 2007 12:19:52 -0500 In-Reply-To: <20071204170827.GH8704@ics.muni.cz> Sender: netdev-owner@vger.kernel.org List-ID: Lukas Hejtmanek wrote: > On Tue, Dec 04, 2007 at 11:02:23AM -0500, Matt Mathis wrote: >> This is probably not an e1000 problem, but a general Ethernet "feature". >> If you defeat auto-negotiation to force the data rate, you implicitly >> defeat duplex negotiation as well. You need to explicitly set the duplex >> mode. > > ethtool reports, that I have full duplex line: Matt was almost right - the link partner however might be working in half duplex mode. in case you force speed/duplex, you are *required* to force the exact same setting on the link partner, otherwise things like this can happen. if you "just" want to disable gigabit speed, get the latest ethtool and run: ethtool -s eth0 advertise 0x0f which keeps autonegotiation enabled but tells the e1000 card to _not_ advertise gigabit speed capability to the link partner. The link partner and the e1000 can then decide with autonegotiation whether to use 10half 10duplex 100half or 100full. Auke