So I screwed up. Sorry!
BFS 370 causes some strange regressions as per this blog and offlist. It appears that F&H doesn't, for example, scale to multiple CPUs under BFS 370. Also some latency regressions were reported here (and elsewhere). So I've decided to pull BFS 370 and 2.6.38-ck2, pending further investigation. There's only so much I can do without lots of people testing, I'm afraid, and often I get 1 maybe 2 people testing before a "stable" release, and then get about 10,000 downloads once the stable release comes out. So it was with test2/BFS370. Anyway the point is, go back to 2.6.38-ck1 or BFS 363 till I figure out what the problem was and decide whether it's worth pursuing this avenue or not.