From owner-freebsd-net@FreeBSD.ORG Sun Mar 2 16:23:20 2008 Return-Path: Delivered-To: net@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 088711065672 for ; Sun, 2 Mar 2008 16:23:20 +0000 (UTC) (envelope-from if@xip.at) Received: from chile.gbit.at (ns1.xip.at [193.239.188.99]) by mx1.freebsd.org (Postfix) with ESMTP id 456E18FC1A for ; Sun, 2 Mar 2008 16:23:18 +0000 (UTC) (envelope-from if@xip.at) Received: (qmail 9780 invoked from network); 2 Mar 2008 17:23:17 +0100 Received: from unknown (HELO filebunker.xip.at) (86.59.10.180) by chile.gbit.at with (DHE-RSA-AES256-SHA encrypted) SMTP; 2 Mar 2008 17:23:17 +0100 Date: Sun, 2 Mar 2008 17:23:16 +0100 (CET) From: Ingo Flaschberger To: Barney Cordoba In-Reply-To: Message-ID: References: <644693.83415.qm@web63910.mail.re1.yahoo.com> User-Agent: Alpine 1.00 (LFD 882 2007-12-20) MIME-Version: 1.0 Content-Type: TEXT/PLAIN; format=flowed; charset=US-ASCII Cc: net@freebsd.org Subject: Re: FBSD 1GBit router? X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Networking and TCP/IP with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 02 Mar 2008 16:23:20 -0000 Dear Barney, >> PCIe cards are 1x because the chips are all wired for >> 1x. Intel has a marketing plan. Its not to use low-end >> chips for high-end operations. Intel is just going to >> cannibalized their own business by putting out higher >> performance low-end chips. > > really? > the 1 port server chip use only 1 lane > the 2 port server chip use only sorry, forgotten to finish this part: The 1 and 2 port intel server gbit chipset have a 4x lanes pci-e conection. The 1 port card only use 1x lane. The 2 port card use 4x lanes. The 4 port card use 4x lanes. pci-e bus speeds: http://www.s-t-e.de/index.html?http%3A//www.s-t-e.de/content/Articles/Articles_08b.html (sorry, only in german) http://www.s-t-e.de/content/Articles/images/Articles_08/PCIe_EffVSPay_f24_sml.gif there you see the efficency with different payloads. minimal ethernet packet size of 64 byte has a efficency of 0.4 with small packets you will be able to achieve 800mbits, whats not bad. perhaps with the 2 port-cards it would be better, but I think, the system io of the processor will start limiting. Kind regards, Ingo Flaschberger