From: Erika Rice (erice@cs.washington.edu)
Date: Tue Oct 19 2004 - 11:00:00 PDT
"Congestion Control for High Bandwidth-Delay Product Networks" by Dina
Katabi, Mark Handley, and Charlie Rohrs:
Although the designers of the Internet understood the diversity of the
networks they would be connecting, it took time for people to fully
understand the impact of having a network composed of links with wildly
different bandwidth-delay products. The high bandwidth optical
connections and long delay satellite connections present in today's
Internet pose problems for the traditional congestion control provided
by TCP.
In "Congestion Control for High Bandwidth-Delay Product Networks" Dina
Katabi, Mark Handley, and Charlie Rohrs present a new protocol, the
eXplicit Control Protocol (XCP) to replace TCP. Their testing shows
that XCP handles both congestion and fairness better than TCP and show
stability for large bandwidth-delay product links.
Perhaps the most interesting characteristic of their scheme is that the
constant parameters for the protocol are based on mathematical
principles rather than specific network conditions. This increases the
flexibility of their protocol; the constants will not have to be
changed in every router (or risk bad performance). The provable
stability of this protocol is an admission that networks have and will
continue to change more than any protocol based on specific network
conditions can handle.
The flexibility, stability, and low router computation overhead of this
protocol show that is possible to have a network control protocol that
performs well and has good theoretical properties.
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