NetBSD-SoC: TCP ECN support

What is it?

ECN stands for Explicit Congestion Notification and is another TCP congestion control algorithm to make your delay-sensitive low-traffic applications smoother.

It works by marking packets (the router) when a congestion is about to occur. Before congestion occurs the sender has the chance to reduce the transmission window, thus avoiding dropped packets.

Status

Handshake done (on a SYN or SYN-ACK rexmt ECN is disabled on a per tcpcb basis). Number of rexmt's before bailing out to non-ECN is configurable by net.inet.tcp.ecn.maxretries.
Setting ECT codepoint: done. Will use draft-ietf-tcpm-ecnsyn-00.txt.
Handling CE codepoints: done

2006-05-23: Google publishes accepted/rejected projects. Go!
2006-06-26: Google solicits mid-program mentor evaluations of student progress
2006-06-30: All mid-program evaluations of student progress due by 17.00 Pacific Standard Time
2006-08-20: Start the work on the project. I expect to be beer full.
2006-08-21: All student projects due by 08.00 Pacific Standard Time
2006-09-05: All mentor and student evaluations due by 08.00 Pacific Standard Time

Deliverables

Code and some docs on what ECN is and what it does.

Mandatory (must-have) components:

Working end-host ECN implementation.
Implementation test results.

Documentation

Rui Paulo <rpaulo@fnop.net>

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