Path: utzoo!utgpu!jarvis.csri.toronto.edu!cs.utexas.edu!tut.cis.ohio-state.edu!rutgers!ispi!jbayer
From: jbayer@ispi.UUCP (Jonathan Bayer)
Newsgroups: comp.dcom.modems
Subject: Re: poor uucp performance - help! (LONG)
Message-ID: <1318@ispi.UUCP>
Date: 23 Feb 90 12:26:42 GMT
References: <125@cdss.UUCP> <1990Feb17.063412.18455@rancho.uucp> <959@codonics.COM>
Organization: Intelligent Software Products, Inc.
Lines: 29

bret@codonics.COM (Bret Orsburn) writes:

>In article <1990Feb17.063412.18455@rancho.uucp> rock@rancho.uucp (Rock Kent) writes:
>>
>>4.  Make sure that you have compression turned off.  You don't want to
>>    be compressing already compressed news batches.
>>

>OK, I'll bite: Why not?

>Surely, compression will be less effective the second time, but is there
>any good reason to disable it? Do you have any data to demonstrate that
>throughput is *decreased* by enabling compression for a compressed newsfeed?


Yes it is.  Remember, compression takes time.  The idea behind
compression on the fly is to save characters at the cost of time,
hopefully there will be a net gain.  However, compressed files usually
are not compressable.  Therefore if the modem is trying to compress the
data and it can't it will slow down because it is trying to do a
compress, and may actually send MORE characters due to a
non-compression.


JB
-- 
Jonathan Bayer		Intelligent Software Products, Inc.
(201) 245-5922		500 Oakwood Ave.
jbayer@ispi.COM		Roselle Park, NJ   07204