How to Quicken TCP Re-transmission?

[Mark Allman]

> 
> > You can take a look at SCPS - http://www.scps.org/ Their protocol is
> > used on lossy links with big latency and packet loss (such as
> > satellites) and overcomes shortcomings of TCP.  It works with divert
> > mechanism of FreeBSD and I ported the tap device part as well to both
> > NetBSD / FreeBSD (experimental).
> 
> It's not clear to me that this is going to help.  Fundamentally, TCP and
> SCTP share the same congestion control response.  At 30% packet loss
> SCTP ought to be as unusable as TCP.  Both consider losses to be
> indications of network congestion.
> 
> SCTP does have some things built-in that need to be added onto TCP
> (e.g., SACK).  So, we could expect more consistent behavior from SCTP
> across implementations and platforms.  But, in the end the performance
> of both is proportional to 1/sqrt(p) where p is the loss rate.  So, as
> the loss rate increases performance decreases.  At 30% you're
> essentially cooked no matter which you use.

Ugh... Monday mornings... You'll note that what I quoted was about
"SCPS" and what I wrote about was "SCTP".  These are different.  Ignore
me.

allman



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