Date: Thu, 18 Jan 1996 20:09:25 -0500 (EST) From: "Jonathan M. Bresler" <jmb@FreeBSD.org> To: Michael Smith <msmith@atrad.adelaide.edu.au> Cc: wes@intele.net, questions@FreeBSD.org Subject: Re: delays in ppp solved Message-ID: <Pine.BSF.3.91.960118200847.23971F-100000@Aspen.Woc.Atinc.COM> In-Reply-To: <199601180521.PAA05556@genesis.atrad.adelaide.edu.au>
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On Thu, 18 Jan 1996, Michael Smith wrote: > 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. no me! i did not say that. i said the part below starting with " hmmm.....modem makers" > > 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." [[ > > Jonathan M. Bresler FreeBSD Postmaster jmb@FreeBSD.ORG play go. ride bike. hack FreeBSD.--ah the good life i am moving to a new job. PLEASE USE: jmb@FreeBSD.ORG
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