At 05:51 PM 1/14/2011, Evandro Menezes wrote...
On Jan 14, 3:14 pm, Evandro Menezes <[email protected]> wrote:
> On Jan 13, 7:38 pm, [email protected] (Mike S) wrote:
> > I was able to force the kernel to use the 8259 by adding
> > "clocksource=acpi_pm" to the boot options. The available clock
sources
> > can be found with "cat
> >
/sys/devices/system/clocksource/clocksource0/available_clocksource".
>
> FWIW, the 8259 is the PIT, not the ACPI timer.
Ahem, the 8254 is the PIT, not the ACPI timer.
Yep, and if I'm not mistaken, the ACPI timer interrupt is routed
through the APIC, which is basically a fancy 8259 PIC. Of course, there
is no 8254 or 8259 or APIC on any modern motherboard, just subsets of
devices (e.g. south bridge chip) which provide equivalent
functionality. One might also say that the PIT is not an 8254, and the
PIC is not an 8259, etc. and complain about that, too.
In any case, pedanticism aside, the whole point was to avoid using the
HPET (which - trying to satisfy the pedants again - is not a thing, but
a function), because it gets set up inconsistently. acpi_pm worked for
me. The choices I had available were tsc, hpet, and acpi_pm (pit was
not a choice). I didn't even bother trying tsc, since I understand
there's a strong likelihood of issues due to processor frequency
scaling.
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