On May 10, 2008, at 4:13 PM, Chris Buechler wrote:
3) ACPI issues - try disabling ACPI, sometimes it causes time
keeping issues.
You can also selectively disable the ACPI timer device without turning
ACPI off entirely. Add the following to your /boot/loader.conf file:
debug.acpi.disabled="timer"
You'll see a change at the beginning of your kernel boot messages like
this:
Timecounter "i8254" frequency 1193182 Hz quality 0
Timecounter "ACPI-fast" frequency 3579545 Hz quality 1000
Timecounter "HPET" frequency 14318180 Hz quality 900
The "ACPI-fast" line will go away, and the kernel will then be forced
to choose a different timekeeping method.
You can verify your timekeeper with this command:
sysctl sysctl kern.timecounter.hardware
It will list one of the available Timecounter options, such as "HPET"
or "ACPI-fast". By default, it picks the highest "quality" timer.
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