I don't know how recently you've checked Zawodny's writings on the matter, but he says most problems are fixed, so long as you're using MySQL on FreeBSD 5.0 or newer compiled against the LinuxThreads library. I was wondering after reading that if anything like that had been tried for PM. I guess this is a good time to ask.
I know you guys had already made some progress regarding coaxing MySQL on FreeBSD into performing better. Is there any more progress lately, perhaps around this new information out of Yahoo?