Messages in this thread | | | Date | Fri, 15 Mar 2002 21:35:49 +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:
> >> Idle tasks nowdays don't spin waiting for need->resched to change, > >> they sleep on a halt insn instead. Therefore any setting of > >> need->resched on an idle task running on a remote CPU should be > >> accompanied by a cross-processor interrupt. > > > > this is broken as well. Check out the idle=poll feature i wrote some time > > ago. > > The idle=poll stuff is a hack. [...]
it's a feature.
> [...] I'd like my idle cpus to sleep and still have them wake up the > moment work for them becomes available. I see no reason why an idle cpu > should be forced to remain idle until the next tick, nor why fixing that > should be considered `broken'.
performance. IPIs are expensive.
Ingo
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