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000123_news@newsmaster….columbia.edu _Mon Jan 26 15:05:00 1998.msg
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From: fdc@watsun.cc.columbia.edu (Frank da Cruz)
Newsgroups: comp.protocols.kermit.misc
Subject: Re: need file transfer info
Date: 26 Jan 1998 20:04:58 GMT
Organization: Columbia University
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In article <6aints$kb9$1@mozart.jlc.net>,
Glenn Sherman <gsherman@remove_this.jlc.net> wrote:
: >: What kind of speed (cps) should I expect to get with kermit over TCP/IP ?
: >:
: >That would depend on the underlying communications medium: Dialup, 10Mbps
: >Ethernet, 100Mbps Ethernet, etc. On the faster mediums, the computer tends
: >to become the bottleneck. It also depends on whether you are making a
: >connection from one node on your local net to another on the same net, or if
: >you are going out over the Internet, and to what extent the net (and each
: >segment of it, and each router, etc) are congested.
: >
: >: using the -Q option boosted the transfer to 28000 cps.
: >:
: >That would be pretty good for a V.34 PPP connection, not very good for a
: >direct Ethernet connection. For long-haul TCP/IP connections, rates can
: >vary just as much as FTP; in this case the net itself tends to be the
: >bottleneck.
:
: Sorry, It is a local network connection over 10Mbps Ethernet.
:
Then 28000 cps is not very good. You can expect anywhere from 0 cps to
1000000 cps, depending on:
1. The load on the local net (collision rate, etc, watch the lights).
2. The load on the two end systems.
3. The settings and configuration of the two Kermit programs.
4. The nature of the data (e.g. how compressible it is).
The newer the Kermit program, the faster it will go, as we have been working
on performance in each new release. Current releases, such as C-Kermit 6.0
and Kermit 95 1.1.15, can, with proper tuning, go at maybe 30-50 percent of
FTP speed. The next round of releases will be comparable to FTP and faster
in some cases. Watch this space for announcements.
- Frank