From owner-freebsd-net@FreeBSD.ORG Mon Feb 28 16:11:28 2005 Return-Path: Delivered-To: freebsd-net@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 2834416A4CE; Mon, 28 Feb 2005 16:11:28 +0000 (GMT) Received: from ox.eicat.ca (ox.eicat.ca [66.96.30.35]) by mx1.FreeBSD.org (Postfix) with ESMTP id C3DDD43D48; Mon, 28 Feb 2005 16:11:27 +0000 (GMT) (envelope-from dgilbert@daveg.ca) Received: by ox.eicat.ca (Postfix, from userid 66) id DAB5AF222; Mon, 28 Feb 2005 11:11:26 -0500 (EST) Received: by canoe.dclg.ca (Postfix, from userid 101) id B2FB34662; Mon, 28 Feb 2005 11:11:25 -0500 (EST) From: David Gilbert MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Message-ID: <16931.17069.667570.224967@canoe.dclg.ca> Date: Mon, 28 Feb 2005 11:11:25 -0500 To: Lister In-Reply-To: <4222C64D.4050007@primetime.com> References: <4222C64D.4050007@primetime.com> X-Mailer: VM 7.17 under 21.4 (patch 17) "Jumbo Shrimp" XEmacs Lucid cc: freebsd-net@freebsd.org cc: freebsd-performance@freebsd.org Subject: ng_fec and cisco 2931 X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Networking and TCP/IP with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 28 Feb 2005 16:11:28 -0000 >>>>> "lister" == lister writes: lister> I have setup ng_fec on a machine with a quad ethernet NIC : lister> de0: port 0xd000-0xd07f mem Our own testing with this card (not using fec ... just traffic on the 4 ports) has determined that it appears to have a 100 megabit limit to the total of 4 ports on the card. Now... this could be a FreeBSD driver issue ... or a PCI bus issue, but in all our tests with several motherboards and many versions of FreeBSD (from 3.2 or so through about 4.5) we were never able to achieve more than 100 megabit on the card in total. Our application was an NFS server that had 100's of diskless nodes running from it. We suspected that this could be some interaction between the speed of the disks (and their pci cost) and the card, so we isolated the card by doing straight packet tests (no meaningful data) and still found the card maxxing out at 100 megabit total over the 4 ports. Dave. -- ============================================================================ |David Gilbert, Independent Contractor. | Two things can only be | |Mail: dave@daveg.ca | equal if and only if they | |http://daveg.ca | are precisely opposite. | =========================================================GLO================