my experiences with 6.2-RELEASE were HORRIBLE memory management was at an all time low php would spawn process which would increase the load on www php and mysql loads would get up over 40 then the box would reboot. So then we tried load balancing with our firewall PF and the freebsd box and trying different combinations of http&php requests go to the obsd box and mysql on the fbsd box etc. and Freebsd 6.2 was horrible
NOTE this wasnt with DA just your typical webserver installation via ports the exact same installation i'd done many times.