From ilug-admin@linux.ie Wed Oct 9 10:53:59 2002 Return-Path: Delivered-To: zzzz@localhost.example.com Received: from localhost (jalapeno [127.0.0.1]) by example.com (Postfix) with ESMTP id 87C3616F21 for ; Wed, 9 Oct 2002 10:52:32 +0100 (IST) Received: from jalapeno [127.0.0.1] by localhost with IMAP (fetchmail-5.9.0) for zzzz@localhost (single-drop); Wed, 09 Oct 2002 10:52:32 +0100 (IST) Received: from lugh.tuatha.org (postfix@lugh.tuatha.org [194.125.145.45]) by dogma.slashnull.org (8.11.6/8.11.6) with ESMTP id g98J3VK29996 for ; Tue, 8 Oct 2002 20:03:31 +0100 Received: from lugh.tuatha.org (localhost [127.0.0.1]) by lugh.tuatha.org (Postfix) with ESMTP id 86B9F341CF; Tue, 8 Oct 2002 20:04:15 +0100 (IST) Delivered-To: linux.ie-ilug@localhost Received: from linuxmafia.com (linuxmafia.COM [198.144.195.186]) by lugh.tuatha.org (Postfix) with ESMTP id D5CE23410E for ; Tue, 8 Oct 2002 20:03:42 +0100 (IST) Received: from rick by linuxmafia.com with local (Exim 3.36 #1 (Debian)) id 17yzgl-0001zv-00 for ; Tue, 08 Oct 2002 12:06:39 -0700 To: "'ILUG'" Subject: Re: [ILUG] Modem question Message-Id: <20021008190633.GV11235@linuxmafia.com> References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.4i X-Mas: Bah humbug. From: Rick Moen Sender: ilug-admin@linux.ie Errors-To: ilug-admin@linux.ie X-Beenthere: ilug@linux.ie X-Mailman-Version: 2.0.11 Precedence: bulk List-Help: List-Post: List-Subscribe: , List-Id: Irish Linux Users' Group List-Unsubscribe: , List-Archive: X-Original-Date: Tue, 8 Oct 2002 12:06:33 -0700 Date: Tue, 8 Oct 2002 12:06:33 -0700 X-Spam-Status: No, hits=-30.1 required=5.0 tests=AWL,IN_REP_TO,KNOWN_MAILING_LIST,REFERENCES, SIGNATURE_SHORT_DENSE,T_NONSENSE_FROM_00_10,USER_AGENT, USER_AGENT_MUTT version=2.50-cvs X-Spam-Level: Quoting Breathnach, Proinnsias (Dublin) (breatpro@exchange.ie.ml.com): > Is there any reliable way to calculate your connection speed if you don't > trust what the modem reports? Do a wget of a file of known length, in a script that runs "date" before and after (or equivalent). Be aware that speed between you and your upstream link is one thing; speed through countless congested routers to a faraway location may be quite another. Remember that hardware-level compression is a factor. (The file you wget will probably be precompressed.) In the area of the slightly more exotic, be aware that different traffic may have higher priority and thus more available bandwidth at various points in the transit to/from you -- and that some traffic may go via different paths coming vs. going. Be aware that raw bulk transfer speed may not be the only thing that matters: Depending on what you're doing, the modem's connection latency might matter, and this differs widely between modems. (It matters more for interactive sessions, e.g., ssh remote logins, where each keystroke is echoed from remote.) -- Cheers, "Send a policeman, and have it arrested." Rick Moen -- Otto von Bismarck, when asked what he rick@linuxmafia.com would do if the British Army landed. -- Irish Linux Users' Group: ilug@linux.ie http://www.linux.ie/mailman/listinfo/ilug for (un)subscription information. List maintainer: listmaster@linux.ie