On Thu, 2007-05-03 at 10:01 +1000, Paul Mackerras wrote:

Benjamin Herrenschmidt writes:

quoted

On Wed, 2007-05-02 at 16:33 +0200, Johannes Berg wrote:

quoted

On Wed, 2007-05-02 at 20:55 +1000, Paul Mackerras wrote:

quoted

Ultimately we want to put the disabled cpus in sleep mode, but that
will require a suitable cache flush routine.

I don't have any docs for the particular processors the G5s have, do
they have a sleep mode?

They have, but the cache flush is not trivial to do (and might imply
access to non documented bits). So let's put that on the to-do list and
stick to NAP for now while I dig something.

Hmmm, I went looking in the 970FX manual for sleep mode and didn't
find it, only nap and doze...

Ah... hrm... so it's possible that Darwin goes NAP but flushes the cache
before suspend-to-ram bcs the CPU is going down... let me check.

Nah, darwin uses HID0:sleep

Ben.