Messages in this thread | | | Date | Fri, 15 Mar 2002 21:57:06 +0100 (CET) | From | Ingo Molnar <> | Subject | Re: [PATCH] 2.4.18 scheduler bugs |
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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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