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    SubjectRe: SMP cpu deep sleep
    On Sat, 2004-08-21 at 02:44, Wes Felter wrote:

    > The CPU hotplug patch is the way to go, but the hardware is the problem. I
    > talked to an Intel CPU architect at MICRO last year and he confirmed that
    > SMP Intel systems don't support any low-power modes besides HLT. AMD's
    > documentation says that Opterons support voltage/frequency scaling (aka
    > Cool 'n' Quiet), but AFAICT the documentation is wrong. In summary, you
    > are doomed.

    Well, with intel CPUs maybe ;) On PPC we can put some CPUs (at least the
    desktop ones and the 970, I don't know about POWER3/4/5) into SLEEP mode
    after flushing all caches & masking all IRQs to them, and get them out
    via an IPI, or we can mask EE as well and get them out via a soft reset
    if we have access to it.


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