Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!mailrus!ncar!boulder!sunybcs!sbcs!kepler1!vipoon
From: vipoon@kepler1.UUCP (Victor I Poon)
Newsgroups: news.sysadmin
Subject: Re: How to speed up uucp with Telebits(only get 9600 out of 386)
Keywords: serial 80386 telebit 19,200
Message-ID: <144@kepler1.UUCP>
Date: 18 Jul 89 22:21:52 GMT
References: <200038@hrc.UUCP> <1160@intercon.UUCP> <1989Jul8.042330.19789@wobble.uucp> <37631@sgi.SGI.COM> <14@fmsystm.UUCP> <1085@ispi.UUC
Reply-To: vipoon@kepler1.UUCP (Victor I Poon)
Distribution: usa
Organization: Kepler Financial Mgmt, Setauket, NY
Lines: 27

In article <1085@ispi.UUCP> jbayer@ispi.UUCP (Jonathan Bayer) writes:
>
>Find the line in /etc/gettydefs which refers to the speed EXTA.  That is
>19200 baud.   Make the change in /etc/ttys (for logins).  Make the
>change in your /usr/lib/uucp/Devices file (and possibly
>/usr/lib/uucp/Systems) for uucp.

	Interestingly enough, I called SCO about this once and they told
me that they do not really support EXTA as a baud rate.  I mean to say,
it's there, you can use it, but you won't get 19,200 bps throughput.
Generally at 19.2k, the UART must interrupt the processor every
521us which seems to me that the driver code better be well written
otherwise it won't be serviced in time.  I maybe wrong on this, someone
please correct me if I am.

	Most of the stats that I've seen people post claim to get a 
throughput around 11k-12k bps.  I was wondering if they ever did a
comparison on how much time was wasted in logging in/out, the delay
for creating a new file, etc.  I guess this would be a comparison
between the time on the phone vs. the time involved with transmitting
the file.

Victor
-- 
Victor I. Poon		{acsm, lilink, polyof, sbcs}!kepler1!vipoon
Kepler Financial Management, Ltd.
It was the best of times, It was the worst of times, ...