When you install the VMware tools in a FreeBSD 6.0 guest OS in VMware Server Beta, you get the following error message in the console every few seconds:
calcru: runtime went backwards from 10542602 usec to 10542600 usec for pid 13924
FIX 1:
sysctl kern.timecounter.hardware=TSC
FIX 2: Add the following line to /boot/loader.conf
kern.hz=200