DragonFly commits List (threaded) for 2009-05
Re: DragonFly-188.8.131.524.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
:> Then on entry to C3/C1E the ACPI code could explicitly call
:> cputimer_intr_sleep_reload(), and on exit it could explicitly
:> 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.