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Article #364

Re: speed capabilities of cisco terminal servers

#364
From: RHUNTER
Date: Wed, 02 Sep 1992 07:30
23 lines
1715 bytes
I don't know whether it is relevant here on the Cisco bulletin board but...

I have done a fair amount of testing of XRemote over SLIP (from NCD X-terminals
 to Cisco MGS). This involved satellite as well as terrestrial (tropo-scatter)
radio. The main outcome of this is that X-remote functions best on LOW DELAY
 rather than HIGH bandwidth. e.g. a link at 9k6 with no delay could outperform
an error-corrected/compressed link at 19k2 with 20msec delay. Don't be misled
by claims of 4 fold compression using v42bis. The data in X-remote is already
heavily compressed by the X-remote satck. It is also error protected by TCP.
The explanation for the heavy dependence on delay is that although it's running
 over TCP with a large window size, X11 has a window size of 1 higher up.
You can run it a 2Mbit over a satellite & it will never use more than 16k.
It is actually then better to run raw X over tcp/ip!

I think the main problem you are going to have is memory hogging, rather than
processor speed. Each user will need approx 100k once they start multi-windows

I await the resulting flaming with bated breath.

Ray Hunter. Comms Engineer

This work was done for a previous employer: since I no longer have the pleasure
 of working for them I can't possibly speak for them!
Technical Details
Message-ID: <92246.083033RHUNTER@ESOC.BITNET>
Path: arc1-ca.pugleaf.net!sparky!uunet!news.univie.ac.at!blekul11!frmop11!dearn!esoc!rhunter
References: <Sep.1.22.12.11.1992.23056@athos.rutgers.edu>

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Path: arc1-ca.pugleaf.net!sparky!uunet!news.univie.ac.at!blekul11!frmop11!dearn!esoc!rhunter
Organisation: European Space Operation Centre (E.S.O.C)
Date: Wednesday, 2 Sep 1992 08:30:32 CET
From: <RHUNTER@ESOC.BITNET>
Message-ID: <92246.083033RHUNTER@ESOC.BITNET>
Newsgroups: comp.dcom.sys.cisco
Subject: Re: speed capabilities of cisco terminal servers
References:  <Sep.1.22.12.11.1992.23056@athos.rutgers.edu>
Lines: 24