[p2p-hackers] Using UDT for swarming

Justin Chapweske justin at chapweske.com
Tue Jan 25 22:35:39 UTC 2005


On Tue, 2005-01-25 at 14:13 -0800, Serguei Osokine wrote:
> On Tuesday, January 25, 2005 Justin Chapweske wrote:
> > The FLUTE/ALC/LCT stack does indeed solve the long fat network 
> > problem and we have a number of customers deploying the solution 
> > for transfer of extremely large data sets (100 GB+) over both 
> > satellite and terrestrial networks.
> 
> 	So that would be solving only "long fat" or also "different RTT"
> problem? That is, do you handle simultaneous terrestrial (low RTT) and
> satellite (high RTT) streams without the latter getting lower bandwidth
> than it should due to the unfairness of competition with the former?

The "long fat" and "different RTT" are really two faces to the same
problem, so solving one should take care of the other.  Both are caused
by the fact that high RTT flows get pummeled by packet loss, while low
RTT flows are able to bounce back quite quickly after packet loss.

-Justin




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