Re: CCID 2 with slowly-responding AIMD parameters?

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I think this would be a good idea to add this as an option. This
option could be an alternative to interactive applications that use
CCID 3.

-Arjuna

On 11/6/06, Sally Floyd <sallyfloyd@xxxxxxx> wrote:
It would be a simple change to add an option to CCID 2 to have the
sender use
different AIMD parameters.  The obvious possibility would be for the
slowly-responding option to use AIMD (1/5, 1/8) instead of AIMD(1, 1/2).
This means that the congestion window would be increased by 1/5 of an
MSS
rather than by one MSS per round-trip time, and after loss events the
congestion
window would be decreased to 7/8-ths of its old value, not to half of
its old value.
This would differ from the regular CCID 2 by being slowly-responding,
and would
be somewhat similar in its time scales to CCID 3.

This is discussed in some detail in the following:

A Comparison of Equation-Based and AIMD Congestion Control.
Floyd, S., Handley, M., and Padhye, J.
May 2000.
URL "http://www.icir.org/tfrc/";

Is this worth doing?  It would be very simple to specify, and very
simple to
implement.   And it shouldn't have too many surprises in its dynamics.

- Sally
http://www.icir.org/floyd/





--
Electronics Research Group
University of Aberdeen
Aberdeen AB24 3UE
Web: www.erg.abdn.ac.uk/users/arjuna
Phone : +44-1224-272780
Fax :     +44-1224-272497


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