[CUWiN-Dev] TCP Dynamic Right Sizing

[David Young]

On Tue, Apr 26, 2005 at 09:14:32AM +1000, Dan Flett wrote:
> Here's something I saw on another wireless mailing list a while ago, I'm
> thinking it might be of interest to the developers of CUWiN.

Yes, this sort of thing is interesting.  You might also take a look at
Vikas Kawadia's Ph.D. thesis, which has a section on TCP over wireless
networks.  These days Kentaro A. Kurahone is working on TCP in NetBSD,
adding things like SACK.

I have been thinking that on CUWiN nodes, TCP streams should be
intercepted at the ethernet and translated into a stream that has the
right window size and such for the wireless leg.

BTW, NetBSD TCP has set an Internet2 "Land Speed Record,"
<http://bsd.slashdot.org/article.pl?sid=04/05/03/2235255&tid=95>, twice.
This was not using wireless, of course. :-)

Dave

> http://www.hep.ucl.ac.uk/~ytl/tcpip/background/drs.html
> 
> >From the above page:
> "Dynamic Right-Sizing provides automatic tuning of TCP flow control windows
> to support high bandwidth over high-latency (WAN) links. It improves TCP
> throughput by orders of magnitude over high delay-bandwidth links. It also
> keeps windows small for low-bandwidth and low-latency connections so they
> don't consume unnecessary amounts of memory."
> 
> Cheers,
> 
> Dan
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-- 
David Young             OJC Technologies
dyoung at ojctech.com      Urbana, IL * (217) 278-3933