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000257_news@newsmaster….columbia.edu _Sun Feb 22 16:27:12 1998.msg
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From: pclark@iastate.edu (Paul E Clark)
Newsgroups: comp.protocols.kermit.misc
Subject: Re: auto optimize?
Date: 22 Feb 1998 21:18:13 GMT
Organization: Iowa State University, Ames, Iowa USA
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Distribution: usa
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References: <6cmrfn$g4n$1@news.iastate.edu> <6cn0ic$g85$1@apakabar.cc.columbia.edu>
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In article <6cn0ic$g85$1@apakabar.cc.columbia.edu>,
Frank da Cruz <fdc@watsun.cc.columbia.edu> wrote:
>In article <6cmrfn$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
--
Paul E Clark
pclark@iastate.edu