Project page is on the FreeBSD SOC wiki.

To write your own scheduler, read the Documentation first.

FreeBSD 4.11 patches

First patch is the kernel one. To apply, copy it into the sys directory and type:
patch -p1 < hybrid-4_11.patch

Second patch is for the nice command. Copy it into the usr.bin/nice directory and type:
patch < nice-4.11.patch

FreeBSD 5.4 patches

First patch is the kernel one. To apply, copy it into the sys directory and type:
patch -p1 < hybrid-5_4.patch

Second patch is for the nice command. Copy it into the usr.bin/nice directory and type:
patch < nice-5_4.patch

FreeBSD 6 patch

Copy in sys and type:
patch -p1 < hybrid-6
This patch was tested with the CURRENT-SNAP005

Picobsd kernel

If you want to try this scheduler on a diskless machine, you could use picobsd to compile the kernel sources after patching them. If you choose to use picobsd, than you can extract sched.tar.gz in src/release/picobsd and use sched to build your own kernel image