From owner-freebsd-questions Wed Jan 17 21:15:59 1996 Return-Path: owner-questions Received: (from root@localhost) by freefall.freebsd.org (8.7.3/8.7.3) id VAA13910 for questions-outgoing; Wed, 17 Jan 1996 21:15:59 -0800 (PST) Received: from genesis.atrad.adelaide.edu.au (genesis.atrad.adelaide.edu.au [129.127.96.120]) by freefall.freebsd.org (8.7.3/8.7.3) with ESMTP id VAA13855 Wed, 17 Jan 1996 21:15:32 -0800 (PST) Received: from msmith@localhost by genesis.atrad.adelaide.edu.au (8.6.12/8.6.9) id PAA05556; Thu, 18 Jan 1996 15:51:03 +1030 From: Michael Smith Message-Id: <199601180521.PAA05556@genesis.atrad.adelaide.edu.au> Subject: Re: delays in ppp solved To: jmb@FreeBSD.org (Jonathan M. Bresler) Date: Thu, 18 Jan 1996 15:51:02 +1030 (CST) Cc: wes@intele.net, questions@FreeBSD.org In-Reply-To: from "Jonathan M. Bresler" at Jan 17, 96 08:33:08 pm MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: owner-questions@FreeBSD.org Precedence: bulk Jonathan M. Bresler stands accused of saying: > > > Even cheese-less modems will cause some delay, as they have to pause > > and accumulate enough of the incoming data stream to determine that > > compression won't be effective. Since this process is re-started > > each time the communications "turn around", i.e. at each window turn > > for ftp, these small pauses add up over a long transfer. This shows somewhat of a failure to understand how windowed protocols work. 8( > hmmm.....modem makers dont know how to buffer? data coming in, > data getting compressed, data going out. no more data coming in? just > shove out whatever we got. how slow do you think the processors in > modems are? some have 68030's inside. give em ram, rom and mechanicals > and you got decent laser printers :) Er. Most 'cheap' modems have 8-bit microcontrollers (Z180/8051) in them. I've been told of cases where, to obtain the desired throughput, vendors have skimped on the compression (the hard side of the pair) so that the processor could keep up. > Jonathan M. Bresler FreeBSD Postmaster jmb@FreeBSD.ORG -- ]] Mike Smith, Software Engineer msmith@atrad.adelaide.edu.au [[ ]] Genesis Software genesis@atrad.adelaide.edu.au [[ ]] High-speed data acquisition and (GSM mobile) 0411-222-496 [[ ]] realtime instrument control (ph/fax) +61-8-267-3039 [[ ]] "Who does BSD?" "We do Chucky, we do." [[