[Tmrg] (no subject)

[Allen Downey]

Hi All,

I don't think I have the email that started this thread, so I might be
out of line.  But I wanted to suggest that there are some interesting
things that happen in slow start on an uncongested system, depending
on the size of the buffer at the bottleneck relative to the bandwidth-delay
product.

With apologies for this shameless act of self-promotion, I have a paper on
this topic that you can download here:

http://allendowney.com/research/tcp/downey07tcp.pdf

If that's useful, let me know.  If not, I'm sorry for jumping into the
middle!

Cheers,
Allen


 On 11/6/07, Sally Floyd <sallyfloyd at mac.com> wrote:
> >
> > > - The rise time of a single flow to an empty systems is not very
> > > interesting, because it many measures the impact of slow start.
> >
> > Actually, the flow completion time in an uncongested system can be
> > a quite interesting thing to measure, particularly if one is
> > evaluating one of the many proposals for start-ups faster than
> > slow-start.  (One of these proposals is Quick-Start, RFC 4782; some
> > of the others are discussed in Appendix A of RFC 4782.)
> >
> > I would recommend having scenarios include the case of a
> > generally-uncongested link, as well as including cases with various
> > levels of congestion, with metrics including per-flow transfer
> > times, fairness, and aggregate packet drop rates.  This should
> > illustrate some of the good and potentially-bad aspects of protocols
> > with fast start-ups.
> >
> > - Sally
> > http://www.icir.org/floyd/
> >
> > RFC 4782:  http://www.ietf.org/rfc/rfc4782.txt
> >
>
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