On Fri, 15 Mar 2002, Joe Korty wrote:
> > > [...] But on the Athlon the IPI isnt going down a little side channel
> > > between cpus.
> >
> > but even in the Athlon case an IPI is still an IRQ entry, which will add
> > at least 200 cycles or more to the idle wakeup latency.
>
> It is an idle cpu that is spending those 200 cycles.
wrong. When it's woken up it's *not* an idle CPU anymore, and it's the
freshly woken up task that is going to execute 200 cycles later...
Ingo
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This archive was generated by hypermail 2b29 : Fri Mar 15 2002 - 22:00:22 EST