In order to test tc + SFB fully, iproute2 needs to  be released for 2.6.39.

http://devresources.linuxfoundation.org/dev/iproute2/download/

There is the development branch of iproute2 containing the SFB and CHOKe stuff in the 'net-next' branch of the git tree:

git://git.kernel.org/pub/scm/linux/kernel/git/shemminger/iproute2.git

which contains that code.

So far as I know the 2.6.39 kernel contains the following interesting-to-debloaters patches.

SFB, Choke packet schedulers
Fixes to the pfifo_fast qdisc to "do the right thing" for ECN enabled packets
Fixes for ECN with IPv6, which was totally borked before. (I don't know if this patch made it, actually)

The current releases of capetown/cerowrt, nearly final, also have all this stuff backported to 2.6.37.6. These openwrt releases enable RED on the wired wan interface. Theoretically.

Have fun hacking!