FreeBSD via Microsoft Virtual PC 2007 timecounter error Solution

FreeBSD 6.2 安裝在 MS Virtual PC 上如果會看到如下錯誤訊息：

kernel: calcru: negative runtime of -484144 usec for pid 26954 (vim)

Solution:

#Step 1. check timecounter hardware: (could be: kern.timecounter.hardware: ACPI -safe)
sysctl -a | grep timecount

#Step 2. disable ACPI to use TSC
vi /boot/device.hints
hint.acpi.0.disabled="1"