There is an interesting Google Summer of Code project underway to port BFS to FreeBSD and see how it compares to their mainline CPU schedulers, both the V4 scheduler and ULE. The GSOC person porting it has got a rudimentary version of the BFS algorithm working based on the V4 scheduler and has started testing it. His progress shall be interesting to watch. The first results he's getting are interesting already.
His blog is here: rudot.blog.com