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Full Discussion: Performance issue
Top Forums UNIX for Advanced & Expert Users Performance issue Post 32987 by Perderabo on Thursday 12th of December 2002 09:31:08 AM
Old 12-12-2002
You have to look at the entire network, not just the local network. We have systems in India and when I open a telnet connection to one of them it is very slow. But my connection goes across a trans-atlantic cable to Europe, then it bounces off a satellite to a ground station in India, then it uses packet radio to get to our lan. Our lan in India is only 10 Mb, but upgrading it to 100 Mb would not help my telnet session.

Somewhere in that chain is a bandwidth bottleneck. And it's the bottleneck that determines my overall speed.

Also round-trip time is an issue, especially with that satellite bounce. Geosyncronous and geostationary satellites are in deep orbit and a human will easily notice the time it takes to bounce off of them. When I type a character, it must go to the remote system which will echo it back to me. That takes time and more bandwidth won't help that.
 

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PREDICT-G1YYH(1)					      General Commands Manual						  PREDICT-G1YYH(1)

NAME
predict-g1yyh - satellite tracking program DESCRIPTION
The predict-g1yyh program is a variant on the predict satellite tracking program that includes patches from John Heaton, G1YYH, that add new functionality. This man page documents only the features that differ between predict and predict-g1yyh. See the predict man page for information on the features of the program that are not described here! The user may step forwards/backwards through the satellites in the Single-Sat display using the '+' and '-' keys, and may remove blank entries from the Selector page. MultiSat has been reformatted to display upcoming passes below the satellites in view. Using the 'i' and 'k' keys you can toggle between distances in Imperial or Kilometres. Using the 'l' and 'm' keys you can toggle between displaying the normal latitude/longitude or Maiden- head locators for the sub-satellite location. The SingleSat display allows use of the arrow keys to change the frequency up/down and to move to the next/previous satellite using left/right arrows. A new method of selecting satellites is implemented. Instead of pressing a character next to a satellite name, a scrolling menu is pro- vided. This means that the program is now capable of handling a much larget list of satellites, currently a maximum of 250. Finally, the height of the terminal window containing predict can be increased dynamically if you want to display more information than will fit on an 80x24 terminal window! SEE ALSO
predict(1), AUTHOR
This manual page was written by Bdale Garbee <bdale@gag.com>, for the Debian GNU/Linux system (but may be used by others). PREDICT-G1YYH(1)
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