Subject: TCP ECN summer of code project
To: None <tech-net@NetBSD.org>
From: Rui Paulo <firstname.lastname@example.org>
Date: 08/17/2006 08:40:41
My Summer of Code project is mostly finished and I would like you to try
it as much as possible before incorporating it into the tree.
The primary archs I tested it on were i386 and macppc, but I build
tested it on sparc.
To checkout. do the following in your NetBSD src tree:
% cd src/sys
% mv netinet netinet.old
% cvs -d :pserver:email@example.com:/cvsroot/netbsd-soc login
Logging in to
% cvs -d :pserver:firstname.lastname@example.org:/cvsroot/netbsd-soc co
% mv ecn/src/sys/netinet .
% rm -rf ecn
Then build your kernel as usual. (netinet/ is from yesterday's sources).
After booting, you'll see:
% sysctl net.inet.tcp.ecn
net.inet.tcp.ecn.enable = 0
net.inet.tcp.ecn.maxretries = 1
The second one is the number of SYN retransmits the kernel should do
before giving up on ECN and using a non-ECN setup packet.
If you have two distant machines and you think there's a ECN router or
two in the middle, please test this.
Implementation results can be found at:
I'll be back in the weekend for more.
Thanks in advance.