Re: 2.7 thoughts

[Mark Mielke <mark@mark.mielke.cc>]

On Fri, Oct 10, 2003 at 07:47:23AM -0700, William Lee Irwin III wrote:
> On Fri, Oct 10, 2003 at 04:35:29PM +0200, G?bor L?n?rt wrote:
> > Why? Sure, you should note OS before unplug a CPU ;-) but in this case OS
> > should be noticed that it could not use that CPU any more (like scheduler,
> > interrupt delivering etc). And then it's not an issue if you unplug THAT
> > cpu. Sure, some hw supporting is needed, a "normal" motherboard does not
> > like to unplug a CPU when powered of course by hardware issues, but "CPU
> > hotplug capable" motherboards can support this. Maybe of course some notice
> > mechanism is needed for the motherboard as well not only for the OS, but it
> > only mean that notfication before unplugging the CPU should be delivered to
> > the OS _and_ to the hardware. Sure, I have no experience at all in this

Perhaps I've naive here, but - with hot-pluggable CPU machines, do you not
de-activate the CPU through software first, before pulling the CPU out, at
which point it is not in use?

mark

-- 
mark@mielke.cc/markm@ncf.ca/markm@nortelnetworks.com __________________________
.  .  _  ._  . .   .__    .  . ._. .__ .   . . .__  | Neighbourhood Coder
|\/| |_| |_| |/    |_     |\/|  |  |_  |   |/  |_   | 
|  | | | | \ | \   |__ .  |  | .|. |__ |__ | \ |__  | Ottawa, Ontario, Canada

  One ring to rule them all, one ring to find them, one ring to bring them all
                       and in the darkness bind them...

                           http://mark.mielke.cc/