*BSD News Article 25942


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From: storm@cs.mcgill.ca (Marc WANDSCHNEIDER)
Newsgroups: comp.os.386bsd.questions
Subject: Re: NetBSD - routing and slip
Date: 12 Jan 1994 20:48:09 GMT
Organization: SOCS, McGill University, Montreal, Canada
Lines: 40
Message-ID: <2h1nm9$147@homer.cs.mcgill.ca>
References: <2gv4lc$l0i@darkstar.UCSC.EDU> <1994Jan12.142552.6187@jupiter.sun.csd.unb.ca> <CJJ0w6.ADo@usenet.ucs.indiana.edu>
NNTP-Posting-Host: mnementh.cs.mcgill.ca

In article <CJJ0w6.ADo@usenet.ucs.indiana.edu>,
Jim Pitts <pitts@mimosa.astro.indiana.edu> wrote:
>In article <1994Jan12.142552.6187@jupiter.sun.csd.unb.ca>,
>
>>I can get up to 3000 Chars/Sec on kermit transferring binary (gzip'd) files.
>                 ^^^^^^^^^^^^^^    ^^^^^^
>>
>>My machine by the way is a 386DX/25 w 8M Ram and X running constantly.
>>
>
>I find this -very- hard to believe.  I have basically the same set up except
>that I run FreeBSD, the sio device drivers, have a faster CPU and use zmodem
>rather than kermit (I also use ftp with ppp).  I am luck to get 1.2 K/s transfer
>rate with a 16550A.  Either I am doing something drastically wrong or you are
>doing something drastically correct.
>
>I realize that the sio drivers are a slow down, and the 'new' kermit is much
>more efficent than it used to be ... but a factor of 2 or more?
>
>If this sort of performance is really possbile, I would be intrested in seeing
>a discussion on how to get to that level.

	it's not.  you can't compress a gzip file much more than maybe
	a couple of percent, and i think that v42bis isn't willing to spend
	that much time finding out.

	thus, the max transfer rate is about 1400-1500cps on a 14,4 modem
	with gzip'd binaries.

	i see about 1450 on the stock 0.9 com driver with a 16550 on 
	my machine [fast 486, but isaw the same number on a 386/40]



							marc 'em.
-- 
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Marc Wandschneider					    Seattle, WA
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