On Wed, 04 Apr 2007, Tobias Nygren wrote:
> Short answer is to try a different timecounter.
> "sysctl kern.timecounter.choice" to list the choices,
> "sysctl -w kern.timecounter.hardware=i8254" (for example) to choose
> a timecounter.

Yeah, I assumed this was timecounter related and switching to TSC does 
seem to have fixed it, I'm just surprised that i8254 (which is what 
it defaulted to) produced such erratic time.

cheers
mark