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000059_news@columbia.edu_Sun Jan 1 01:46:42 1995.msg
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From: taylorj@ecs.ecs.csus.edu (Jon M. Taylor)
Newsgroups: comp.protocols.kermit.misc
Subject: File transfers are too slow
Date: 1 Jan 1995 01:46:42 GMT
Organization: California State University, Sacramento
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Message-Id: <3e51i2$jka@csusac.ecs.csus.edu>
Nntp-Posting-Host: gaia.ecs.csus.edu
Apparently-To: kermit.misc@watsun.cc.columbia.edu
I know this is a FAQ, but I've already read the FAQ, all the help
files, and played around a lot and I still have speed problems. Soooo....
Situation: I am connecting from my home computer (486/33,
v.32bis modem, latest beta DOS kermit 3.14) to the university computer
(HP 9000/715, OS 9.x) Via a Xyplex terminal server that is set to
swallow XON/XOFF chars and cannot |-< be changed (idiot admins...).
This, BTW, is why I *HAVE* to use Kermit. I used to be able to change
the XON/XOFF passthru, but I now cannot and as a result Zmodem just
refuses to work at all. Yaaay Kermit! I switched out of desperation,
but I am now a convert.
Anyway, I have compiled 5A(190) for HPUX, and it seems to work
correctly (so far, anyway). I get maximal throughput with packet length
set to 2000 (more works OK, but doesn't seem to make a difference in
throughtput), all the control characters from the FAST macro enabled, and
windows set to 1. My modem DTR is locked at 38400, compression and error
correction enabled, and it connects to the Xyplex at 14.4k with
compression and EC on. With this setup, I get ~1150 CPS.
Here's the rub: Things start breaking down with any other window
setting than 1. The symptoms are: About 5 or so (it varies a bit) blocks
will transfer OK, during which the window setting stays at "1 of
[maxwin]". Then, the transfer will halt temporarily (but no retries
occur), and then the next block will transfer at half the original cps and
one more window. Halt, transfer one more block at half the cps and one
more window, and repeat until max windows are reached, at which point the
number of windows returns to 1, the cps maxes out again, and we repeat the
whole cycle. With max windows set to 2, this cycles often, with 32 the
cps drops to about 16(!!!) at about 10 windows and stays there until 32,
when it cycles back to one again.
Some other misc. info:
- stty shows 9600; I changed it to 19200 with indeterminate results. The
Xyplex DTR is set to 19200, I think.
- c-kermit on the HP initially uses XON/XOFF. I'm not sure whether to
change this or not - would the Xyplex need it? I *think* the xyplex uses
XON/XOFF to talk to the HP and DSR/DTR to talk to my modem....
- I use doublespace with a large disk cache.
Also, while I'm here, I want to say thanks to Joe Doupnik (I used
to go to school at USU!) and Frank da Cruz for MS-Kermit and C-Kermit.
NOTHING but Kermit will work over this damn Xyplex, and I'm really glad
it's out there. A couple suggestions: Have the percentage efficiency and
CPS rating be updated in realtime during the transfer, like most other
common protocols do. I currently have to stop the transfer to see these.
Given that most folx need to play with the settings, this would be a nice
touch. Also, since you seem to be aiming for maximum configurablility,
how about an option to completely turn off ALL error checking in the
protocol (like Ymodem-G)? It would add another little speed boost to
those who have EC modems.
I'll live with ~1150 cps if I *have* to, but I see no reason why
I couldn't come close to 1600, *if* Windows worked. Any help is appreciated.
-Jon