Re: [PATCH 0/6] x86/cpu hotplug: Wake up offline CPU via mwait ornmi

[Alan Stern]

On Mon, 4 Jun 2012, Arjan van de Ven wrote:

> > I disagree.  Deactivating a cpu for power saving is halfway to hotplug
> > anyway.  I'd rather unify the two cases, where we can specify how dead a
> > CPU should be, than have individual archs and boards do random hacks.
> 
> well on PC's there really is no difference at least;
> idle equals "all power removed" already there.

This doesn't sound right at all.  Len Brown has often told us that on
Intel chips, power can't be removed from a package until _all_ the
cores in the package are idle.

Alan Stern

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