From owner-freebsd-hackers@FreeBSD.ORG Wed Jul 9 12:02:16 2003 Return-Path: Delivered-To: freebsd-hackers@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id E59A337B401 for ; Wed, 9 Jul 2003 12:02:15 -0700 (PDT) Received: from dan.emsphone.com (dan.emsphone.com [199.67.51.101]) by mx1.FreeBSD.org (Postfix) with ESMTP id 316F543F93 for ; Wed, 9 Jul 2003 12:02:15 -0700 (PDT) (envelope-from dan@dan.emsphone.com) Received: (from dan@localhost) by dan.emsphone.com (8.12.9/8.12.9) id h69J2EHX095730; Wed, 9 Jul 2003 14:02:14 -0500 (CDT) (envelope-from dan) Date: Wed, 9 Jul 2003 14:02:14 -0500 From: Dan Nelson To: Max Clark Message-ID: <20030709190214.GL39506@dan.emsphone.com> References: <20030709181859.GH39506@dan.emsphone.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-OS: FreeBSD 5.1-CURRENT X-message-flag: Outlook Error User-Agent: Mutt/1.5.4i cc: freebsd-hackers@freebsd.org Subject: Re: What ever happened with this? "eXperimental bandwidth delay product code" X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 09 Jul 2003 19:02:16 -0000 In the last episode (Jul 09), Max Clark said: > When you say it's got a specific purpose, I am looking for something > that will dynamically tune a 6Mbit/s, 220ms network link for bulk > (500MB) file transfers. Is this what I think it is, or should I be > looking at something else? Unless you're doing multiple simultaneous TCP connections it'll only slow you down. Your bw*delay product is 6000000/8*.220 = 165Kbytes, so telling ncftp to set its so-bufsize to say 200K, and telling your ftp daemon to do the same thing, should be all you need. -- Dan Nelson dnelson@allantgroup.com