HEADS UP: lapic timer is enabled by default in SMP kernel

[Sepherosa Ziehau <sepherosa@xxxxxxxxx>]

Hi all,

HEAD users only.

lapic timer is enabled by default, it only affects SMP kernel currently.
During boot, you could disable it by setting tunable: hw.lapic_timer_enable="0"
On a running system, you could disable it by: sysctl hw.cputimer_intr_type=0

If you use C3, lapic timer will be disabled when you set
hw.acpi.cpu.cx_lowest to C3.

By default, i8254 interrupt is registered, if you sure that C3 will
not be used, you could set following tunable:
hw.i8254.intr_disable="1"

If you have encountered any problem, please report back.  Thanks.

Best Regards,
sephe

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