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000016_news@columbia.edu_Fri Dec 23 19:55:32 1994.msg
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From: fdc@watsun.cc.columbia.edu (Frank da Cruz)
Newsgroups: comp.protocols.kermit.misc
Subject: Re: ?Improve 20% efficient Kermit xfers?
Date: 23 Dec 1994 19:55:32 GMT
Organization: Columbia University
Lines: 49
Message-Id: <3df9vk$bp4@apakabar.cc.columbia.edu>
References: <3dds2v$k4p@balsam.unca.edu>
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Apparently-To: kermit.misc@watsun.cc.columbia.edu
In article <3dds2v$k4p@balsam.unca.edu>,
Hand Made in America <handmade@cs.unca.edu> wrote:
>C-Kermit on the university end. PC (old Compaq 386/16) running ProComm
>Plus, which includes something called "Super Kermit," on my off-campus
>end. The modem is a Best Data Products "Smart One" 1442F internal Hayes
>clone faxmodem.
>
>Both ends are set for 19200 baud, and that lie makes the theoretical
>throughput at 14400 baud about 73% efficient. I'm transferring compressed
>binary files (*.exe, *.zip, &c.) from my campus home directory on a
>lightly loaded machine to my PC hard disk, over a quiet phone line (0
>packets resent).
>
>Why am I getting only between 20% (with my modem compression enabled) and
>30% (disabled) efficiency. I do understand why my efficiency improves
>when I don't try to compress a compressed file -- I don't understand why
>it is so low overall.
>
>The STATISTICS command shows that I'm passing back a 90-byte packet for
>each one I receive. Is this the fastest way to do Kermit?
>
>Given the primativeness of the "Super Kermit" on my end, what can anyone
>suggest to increase efficiency?
>
(a) Use MS-DOS Kermit instead of Procomm;
(b) Adjust the window size, packet size, and other parameters to achieve
maximum efficiency.
This kind of question is posted every couple days, and rather than repost
the detailed answer each time, I've stored it on kermit.columbia.edu,
directory kermit/e, text mode, faq.txt. Please read it.
I have seen certain newsgroups that seem to have a permanent greeting
message. If I knew how to accomplish this, I could post pointers to FAQs,
etc, so everybody would see them when first accessing this group.
- Frank
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