Satellite tunning

Satellite tunning

Post by Kotek Baraja » Wed, 16 Mar 2005 23:21:02


I'm currently in the process of setting up a satellite link with
dedicated bandwidth connected to the internet.    I'm aware of the
issues with regards to windows/latency and the need to tune TCP
parameters on the satellite link machine.

The machines chief role is to do transactions with another machine
that is co-located on a fast link.  The other machine also accepts
connections from other clients with ADSL type links.

Now I'm wondering what I should do with the other machine,
specifically if I tune this machine with the same settings as the
satellite machine how will it affect the performance of non-satellite

Is it possible to tune TCP parameters on a network interface basis?
For example everything to and from the satellite will go via an
openvpn connections' tun device.

Another possiblity may be to play arround with source of our main
application via IOCTL calls.

Anyone have any insights they can share?

Many thanks in advance.


1. FastTrack 3.02 Tunning


I have a very busy web site using FastTrack 3.02 running on an SGI Origin
200.  I saw this message from the log [06/Nov/1998:10:30:11] failure: Error
accepting connection -5993 (Too man open files).  I have checked with the
SGI web page on OS tunning and FastTrack tunning but still can't fix my
problem.  So what I do right now is to run apache instead.

In fact I found that the bandwidth consumption different between using
apache and FastTrack is double.  Bandwidth consumption using Apache is 1.5M
while FastTrack is 768K.  Moreover I found that the cpu utilization of
running FastTrack is much higher than Apache.

Please give me some hints because my client want to use FastTrack instead of



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