Incorrect time when rebooting & clock drifting
Occassionally you may notice that your system clock is off by a few hours after rebooting, or that your clock is drifting enough that NTP can't keep up. These issues are caused as a result of running FreeBSD in a fully virtualized environment, and there are some steps you can take to correct the problem.
Ensure you have kern.hz="100" in your /boot/loader.conf
Check your kern.timecounter.hardware setting. Some users have reported that setting this to 'i8254' provides a large improvement on Xen virtualized systems.
Run NTPd at boot by adding the following lines to /etc/rc.conf
It's also important to have your CMOS clock setting configured for UTC. You can perform this step at boot, or by running the 'tzsetup' utility.
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