Date: Wed, 17 Jan 1996 08:17:47 -0700 (MST) From: Barnacle Wes <wes@intele.net> To: jmb@freebsd.org (Jonathan M. Bresler) Cc: questions@freebsd.org Subject: Re: delays in ppp solved Message-ID: <199601171517.IAA00439@intele.net> In-Reply-To: <Pine.BSF.3.91.960116211649.15440O-100000@Aspen.Woc.Atinc.COM> from "Jonathan M. Bresler" at Jan 16, 96 09:21:06 pm
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On Tue, 16 Jan 1996, Barnacle Wes wrote:
% 2. Modem compression often interferes with, and lengthens transfer of,
% compressed files such as .gz and .jpg.
> this is indicative of a cheesy modem. LZW with the BT (british
> telecom) extentions will not expand the data. modem compression frees
> your processor for other tasks, letting the modem do some of the work (of
> course the cost here is more bytes thru the serial port since the modem
> un/compresses the data. could be a problem for cheesy uarts or chessy
> clones of decent uarts)
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.
--
Wes Peters | Yes I am a pirate, two hundred years too late
Softweyr | The cannons don't thunder, there's nothing to plunder
Consulting | I'm an over forty victim of fate...
wes@intele.net | Jimmy Buffet
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