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000334_news@columbia.edu_Mon Sep 11 13:14:29 1995.msg
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From: fdc@watsun.cc.columbia.edu (Frank da Cruz)
Newsgroups: comp.protocols.kermit.misc
Subject: Re: Speeding up Kermit
Date: 11 Sep 1995 13:14:29 GMT
Organization: Columbia University
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In article <43004r$hkp@nntp5.u.washington.edu>,
Brian Wirt <wirt@u.washington.edu> wrote:
: My problem is that transfer of compressed files from a host to my home PC
: runs only around 600cps (i.e. zip files) on a 14.4 modem. Uncompressed
: files seem to transfer quite well. Here are the parameters I'm using:
:
: set file type binary
: set receive packet 1024
: set window 4
: set send packet-length 1024
: set block 2
:
That's a good start. A few things to note:
1. The packet length is governed by the file receiver. Thus, when
uploading you have to give the "set receive packet-length" command to
the *other* Kermit program. The "set send packet-length" command
doesn't do anything except override (and only downwards, never
upwards) the *other* Kermit's packet-length request.
2. "set block 3" is recommended. It's generally a false economy to use
less powerful block checks.
Now, why is the transfer still so slow?
1. Check your flow control. Use hardware flow control if possible;
otherwise you are likely to get buffer overruns, and therefore
retransmissions.
2. Try a bigger window size. In general, the bigger the window size,
the better, provided flow control is effective.
3. Try a bigger packet length if your connection is relatively noise
free (and well-flow controlled).
Finally, assuming you are running MS-DOS Kermit 3.14 or C-Kermit 5A(189)
or later, read in the update notes (KERMIT.UPD or ckcker.upd) about
control-character "unprefixing", which will add another 25% to your
throughput right away when transferring ZIP files.
- Frank