Re: [Tsvwg] viewgraphs for a talk in tsvwg in Yokohama tomorrow

Sally-

I have a few comments on Limited Slow-Start for TCP with Large Congestion
Windows.

I've been looking at the slow start overshoot in the context of slow
wireless networks. The control block interdependence seems to be a very good
way to deal with it, as it stores ssthresh from a previous connection and
nicely avoids the overshoot (e.g. Figure 7, p. 28 in
http://www.cs.helsinki.fi/u/gurtov/papers/ms_thesis.html). It also seems to
be more conservative than just starting with unlimited initial ssthresh.

An interesting question is whether the slow start overshoot could be
prevented by an active queue management in the bottleneck queue. RED is not
helpful here as the drop probability is based on the moving average of the
queue size which is generally too slow to react to the exponential TCP
slow-start. I proposed a method for queues with a low level of multiplexing
which is to drop a single packet from a TCP connection when the queue is
over a soft threshold and then wait for a while to let TCP to move from slow
start to congestion avoidance (p. 64). Could something like that be done in
a larger scale? Probably not without keeping some per-connection state in
the router.

Would it be helpful also to include a discussion on another proposed
solution which is the overdamping algorithm in the FACK paper?

Andrei

----- Original Message -----
From: "Sally Floyd" <floyd@icir.org>
To: <tsvwg@ietf.org>
Sent: Wednesday, July 17, 2002 2:41 PM
Subject: [Tsvwg] viewgraphs for a talk in tsvwg in Yokohama tomorrow

> I am giving a talk in tsvwg tomorrow in Yokohama on the two
> drafts on HighSpeed TCP:
>
> HighSpeed TCP for Large Congestion Windows,
> draft-floyd-tcp-highspeed-00.txt
>
> and:
>
> Limited Slow-Start for TCP with Large Congestion Windows,
> draft-floyd-tcp-slowstart-00.txt
>
> The viewgraphs are at:
> http://www.icir.org/floyd/talks/floyd-tsvwg-Jul02.ps
> http://www.icir.org/floyd/talks/floyd-tsvwg-Jul02.pdf
>
> There is also a HighSpeed Web Page at:
> http://www.icir.org/floyd/hstcp.html
>
> ------
>
> If there is time, I might also talk briefly about a somewhat
> more speculative draft:
>
> Quick-Start for TCP and IP,
> draft-amit-quick-start-00.txt
>
> The viewgraphs for this are at the end of the other viewgraph file.
>
> Quick-Start is designed to allow connections to start up more
> quickly than slow-start, after a pass of feedback from all of
> the routers along the path.
>
>
> Thanks,
> - Sally
>
>
>
> _______________________________________________
> tsvwg mailing list
> tsvwg@ietf.org
> https://www1.ietf.org/mailman/listinfo/tsvwg
>

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