From owner-freebsd-net@FreeBSD.ORG Tue Oct 11 18:56:17 2005 Return-Path: X-Original-To: freebsd-net@freebsd.org 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 998DB16A41F for ; Tue, 11 Oct 2005 18:56:17 +0000 (GMT) (envelope-from cswiger@mac.com) Received: from vms044pub.verizon.net (vms044pub.verizon.net [206.46.252.44]) by mx1.FreeBSD.org (Postfix) with ESMTP id 5942B43D45 for ; Tue, 11 Oct 2005 18:56:17 +0000 (GMT) (envelope-from cswiger@mac.com) Received: from [192.168.1.3] ([68.161.71.31]) by vms044.mailsrvcs.net (Sun Java System Messaging Server 6.2 HotFix 0.04 (built Dec 24 2004)) with ESMTPA id <0IO700K2JLSVE3T1@vms044.mailsrvcs.net> for freebsd-net@freebsd.org; Tue, 11 Oct 2005 13:53:20 -0500 (CDT) Date: Tue, 11 Oct 2005 14:53:27 -0400 From: Chuck Swiger In-reply-to: <434C04A7.7090001@fsklaw.com> To: "Thomas M. Skeren III" Message-id: <434C0A27.7060306@mac.com> Organization: The Courts of Chaos MIME-version: 1.0 Content-type: text/plain; charset=us-ascii; format=flowed Content-transfer-encoding: 7bit X-Accept-Language: en-us, en References: <434C04A7.7090001@fsklaw.com> User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7.12) Gecko/20050915 Cc: freebsd-net@freebsd.org Subject: Re: Strange Network Performance 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: Tue, 11 Oct 2005 18:56:17 -0000 Thomas M. Skeren III wrote: [ ...FTP transfer speeds very different... ] > The data transfer rate is about 93.5% of these speeds for smb > transfers. No other server exhibits this behavior. I'm really puzzeled. [ ... ] > Any suggestions as to wtf is up would be appreciated. You should look at "netstat -i" and check for packet errors, perhaps, as well as double-checking cabling and duplex and so forth. This makes a nice network test: ping -i 0.001 -s 1450 -c 100 host.example.com If you adjust "sysctl net.inet.icmp.icmplim" upwards, you can change the count to send as much data as you want. Using a big size is assymmetric and involves much more data sent from the machine running the commmand than is received, using the default side sends roughly equal amounts of data. -- -Chuck