> Speaking for all Intel hardware implemented from pre-history until now,
> deep C-states is the best you can do, and there is no special offline
> mode to save more power.
We don't use deep c states currently; just HLT.
Right now it doesn't make much difference because no multi socket
servers do deep C states and secondary cores can normally not go
deep on their own; but if any of this changes this code would
need to be fixed.
But cpu off line is really a special case -- maybe it is even
possible to do something better on current hardware.
> and if the BIOS is implemented properly, the core will be spinning in the
> deepest available C-state. Of course, it would probably be more interesting
> to simply leave the core on-line and let it go idle...
I don't see any BIOS call in play_dead()
-Andi
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