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Re: Fast TCP?
From: Marshall Eubanks <tme () multicasttech com>
Date: Thu, 5 Jun 2003 06:56:37 -0400


e-VLBI streams can easily sustain packet losses. IMHO these streams should be sent UDP with application layer congestion control, minimal FEC if necessary and "worse than best effort" QOS (because VLBI has little money but an almost infinite ability to generate bits). These TCP based tools may be useful for other applications, but I do not think that they are the right path for e-VLBI.


On Thursday, June 5, 2003, at 02:02 AM, Mans Nilsson wrote:

Subject: RE: Fast TCP? Date: Wed, Jun 04, 2003 at 11:41:22PM -0400 Quoting Deepak Jain (deepak () ai net):

I am not sure why sending a single large/high speed stream today (>1Gb/s) is such an improvement over sending multiple today-streams of data, but I guess that is the difference between a get-it-done-right and a get-it-done-now

Because us RE network operators have customers, especially in the
astronomy field, that want to push 1gbit streams in realtime from
various radio telescopes all over Europe. Moreover, they want them
to end up in one place, ie. converge ;-)

So, we need to come up with technolgies that can sustain multi-gbit
(preferably) TCP streams over 50-100 mS RTT links. And, we've got the
OC192 backbones to do it, if TCP were up to it..

Måns Nilsson         Systems Specialist
+46 70 681 7204         KTHNOC

... bleakness ... desolation ... plastic forks ...

T.M. Eubanks
e-mail : tme () multicasttech com

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