Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933022AbYAaThw (ORCPT ); Thu, 31 Jan 2008 14:37:52 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1760484AbYAaThk (ORCPT ); Thu, 31 Jan 2008 14:37:40 -0500 Received: from trinity.phys.uwm.edu ([129.89.57.159]:37305 "EHLO trinity.phys.uwm.edu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1760038AbYAaThi (ORCPT ); Thu, 31 Jan 2008 14:37:38 -0500 Date: Thu, 31 Jan 2008 13:37:32 -0600 (CST) From: Bruce Allen X-X-Sender: ballen@trinity.phys.uwm.edu To: Bill Fink cc: SANGTAE HA , Linux Kernel Mailing List , netdev@vger.kernel.org, Stephen Hemminger Subject: Re: e1000 full-duplex TCP performance well below wire speed In-Reply-To: <20080131123627.599be68f.billfink@mindspring.com> Message-ID: References: <20080130.055333.192844925.davem@davemloft.net> <20080130082136.1017631d@deepthought> <649aecc70801301617m6331bcb8i8ce60366e182c739@mail.gmail.com> <20080131064533.ef0ae932.billfink@mindspring.com> <20080131123627.599be68f.billfink@mindspring.com> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 810 Lines: 22 Hi Bill, >>> I see similar results on my test systems >> >> Thanks for this report and for confirming our observations. Could you >> please confirm that a single-port bidrectional UDP link runs at wire >> speed? This helps to localize the problem to the TCP stack or interaction >> of the TCP stack with the e1000 driver and hardware. > > Yes, a single-port bidirectional UDP test gets full GigE line rate > in both directions with no packet loss. Thanks for confirming this. And thanks also for nuttcp! I just recognized you as the author. Cheers, Bruce -- 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/