DragonFly-2.3.0.864.gc5b83 master sys/platform/pc32/apic mpapic.c sys/platform/pc32/isa clock.c sys/platform/pc64/isa clock.c sys/platform/vkernel/platform systimer.c sys/sys systimer.h

[Matthew Dillon]

:>    Then on entry to C3/C1E the ACPI code could explicitly call
:>    cputimer_intr_sleep_reload(), and on exit it could explicitly
:
:Implicitly?
:
:>    resynchronize the LAPIC like it does already (I think).

    It may not be relevant if you are going to change the
    acpi_cpu_idle() code to just leave the LAPIC installed as
    the official cpu timer instead of calling cputimer_intr_switch()
    to switch things back and forth.

    For an 8254-based wakeup you would probably want to maintain
    a global cpu mask of cpu's sitting in sleep that need to be
    IPId (instead of IPI'ing all of them), and interlock the updating
    of the 8254's one-shot & notification cpumask with the same spinlock
    the 8254 code uses now (clock_lock()).

    There are a lot of things that could be causing excessive interrupts
    on a multi-cpu platform, the code is going to be quite sensitive.

					-Matt
					Matthew Dillon 
					<dillon at backplane.com>