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000256_news@newsmaster….columbia.edu _Sat Feb 21 11:49:20 1998.msg
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From: fdc@watsun.cc.columbia.edu (Frank da Cruz)
Newsgroups: comp.protocols.kermit.misc
Subject: Re: auto optimize?
Date: 21 Feb 1998 16:49:16 GMT
Organization: Columbia University
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In article <6cmrfn$g4n$1@news.iastate.edu>,
Paul E Clark <pclark@iastate.edu> wrote:
: ISU has installed kermit 6.0
:
On what platform?
: i am now having trouble downloading files.
:
What software are you using to download the files? On what kind of
connection?
: before they began using this version i had packet lengths set to 1500
: and they worked fine. now with automatic packet-length optimization it
: seems to spend all of its time trying to "optimize" and very little of
: its time downloading. it switches packet lengths settings every few
: seconds and does not seem to download while doing these switches. the
: people i have asked about this suggested to set packet length lower and
: set window to 3 and block to 3. and to just start experimenting with
: these settings. no matter WHAT i set packet length to, i still have the
: same problem. it endlessly switches and hardly downloads. i have tried
: enough combinations of settings that i am convinced this will not help.
:
I think something else must be wrong. What version of Kermit were you
using before 6.0? What settings did you use in this version? Can you
still use this version on the same host and connection without any
problems?
Any problems you are having with 6.0 can be diagnosed and fixed. Just
send a report with the details of the computers, OS's and versions, and
Kermit programs and versions on each end, and of the connection itself,
and your settings on each end to:
kermit-support@columbia.edu
and we'll take care of it.
Automatic packet length adjustments are done for two reasons:
1. To find the best length in the first place. You can use the
command "set transfer slow-start off" to tell C-Kermit not to
do this;
2. To reduce the packet length after a transmission error has been
detected or a timeout has occurred, in order to reduce the
chances that this will happen again with the next packet. After
this, once some packets have been exchanged with no errors, the
length grows back.
There is no way to defeat (2) because there is no reason to. If the
packet lengths are changing a lot, this a symptom of a more serious
problem that, when fixed, will also fix the symptom.
See "Using C-Kermit", 2nd Edition, 254-256 for a more thorough explanation.
- Frank