John Baldwin wrote:
> >> So each CPU gets (1/num_cpu) * hz clock interrupts/sec?
> >
> > Yes, but because the timer is set to num_cpu*hz, each CPU ends up getting
> > the normal hz interrupts. That's why it runs round-robin but looks like a
> > broadcast.
>
> Eh, are you talking about the Alpha? On x86 we don't do this and have to use
> IPI's to simulate a broadcast-type deal.
You can get real broadcast behaviour *IF* the clock interrupt
comes directly into the APIC, instead of being cascaded through
the ISA PIC. That's kind of the whole point: some motherboards
do, some motherboards don't.
-- Terry
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