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000077_news@columbia.edu _Fri Sep 3 16:50:11 1999.msg
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From: fdc@watsun.cc.columbia.edu (Frank da Cruz)
Subject: Re: C-Kermit 6.0.192 performance on HP-UX 10.20
Date: 3 Sep 1999 20:29:35 GMT
Organization: Columbia University
Message-ID: <7qpb3f$r6p$1@newsmaster.cc.columbia.edu>
To: kermit.misc@columbia.edu
In article <aUVz3.198$_h3.4497@client>, Ye Huang <ye.huang@zweig.com> wrote:
: Hello:
:
: I use Kermit to upload files on both PC (using Procomm Plus 4.5), and
: HP-UX 10.20. To upload a file of 60K size, the Unix side takes 8-9 minutes,
: while the PC side only a couples of minutes. Modems are connected at the
: same speed, 9600bps, and window-size both at 8.
:
Are you talking about two separate setups? If so, what is on each end of
each connection? What are you uploading to? Which program is sending and
which is receiving? What communications and protocol parameters (besides
window size) have you set?
: What can cause such a drastic difference in performance?
:
Any number of things. The book "Using C-Kermit" has a whole chapter that
goes into great detail about performance. There are many factors that go
into the best performance on any particular connection -- primarily window
size, packet length, degree of prefixing, flow control. Also, why restrict
yourself to 9600 bps? Even if all you have is a V.32 modem, you should
still be able to set the serial interface speed 2-4 times higher and let the
modem's built-in compression work for you.
For starters, try giving C-Kermit the "fast" command before starting the
transfer. C-Kermit 6.0 and earlier have conservative ("robust") tuning
by default. See the manual for a complete explanation.
- Frank