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000394_news@columbia.edu_Sun Dec 11 15:18:29 1994.msg
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From: jrd@cc.usu.edu (Joe Doupnik)
Newsgroups: comp.protocols.kermit.misc
Subject: Re: How to Optimize MS-Kermit for Speed
Message-Id: <1994Dec11.211829.35179@cc.usu.edu>
Date: 11 Dec 94 21:18:29 MDT
References: <3cetso$2t8@mark.ucdavis.edu>
Organization: Utah State University
Lines: 31
Apparently-To: kermit.misc@watsun.cc.columbia.edu
In article <3cetso$2t8@mark.ucdavis.edu>, hchau@landau.ucdavis.edu (Hung Chau) writes:
> I was wondering what is the best setup that I can have to make
> my kermit transfer between the Sun and the PC. I have heard
> using using long packet (9024) and setting RTS/CTS control,
> but is there any other tricks that I can use to speed up
> my transfer.
>
> I have also heard about sliding windows and Control Character
> unprefixing but so far sliding windows does nothing for me
> and Control Character unprefixing only make thing worse. If someone
> can explain to me what I am doing wrong or better what exactly
> am I changing when I set sliding windows or Control Character
> unprefixing.
----------------
It's a good question, and one asked (and answered) so frequently
that we really do need an FAQ.
Here are two suggestions. First, read more about it in the MS-DOS
Kermit v3.14 beta docs, binary file mstibm.zip in directory kermit/test/bin
on kermit.columbia.edu.
Second, long packets, plus a few sliding windows slots, brings you
very good performance. Be sure to use adequate flow control everywhere,
preferrably hardware RTS/CTS on the PC+modem. Not all hosts or comms
channels can take lots of bytes in a row so back off if things fail.
For the utmost performance at high risk you may start unprefixing control
codes via the SET CONTROL UNPREFIX command; use only at your own risk.
Remember that the other end has to play along. It may well be that
other end has neither long packet nor sliding windows capabilities. If
so this is an excellent time to upgrade the most likely ancient C Kermit
on the Sun to the modern C Kermit v5A(190). That has all the bells and
whistles. Ftp to kermit.columbia.edu, cd c-kermit, explore, raid&plunder.
Joe D.