On 01/22/13 07:27, Julian Stecklina wrote:
Thus spake Daniel Braniss <[email protected]>:
In the meantime here is some info:
Intel(R) Xeon(R) CPU E5645: running with no problems
LAPIC(600) HPET(450) HPET1(440) HPET2(440) HPET3(440) i8254(100) RTC(0)
Intel(R) Xeon(R) CPU X5550: this is the problematic, at least for the moment
HPET(450) HPET1(440) HPET2(440) HPET3(440) LAPIC(400) i8254(100) RTC(0)
Does anyone know why the LAPIC is given a lower priority than HPET in
this case? If you have an LAPIC, it should always be prefered to HPET,
unless something is seriously wrong with it...
Julian
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This may help:
"Problem with LAPIC timer is that it stops working when CPU goes to C3
or deeper idle state. These states are not enabled by default, so unless
you enabled them explicitly, it is safe to use LAPIC. In any case
present 9-STABLE system should prevent you from using unsafe C-state if
LAPIC timer is used. From all other perspectives LAPIC is preferable, as
it is faster and easier to operate then HPET. Latest CPUs fixed the
LAPIC timer problem, so I don't think that switching to it will be
pessimistic in foreseeable future.
--
Alexander Motin"
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