Hi!
> here is an attempt to explain why...
>
> >
> > Something which remains to be beaten into my head: *why* does HOTPLUG_CPU
> > require flat pyhsical mode? What necessitated that change, and cannot we
> > make it work OK in logical mode as well as flat mode?
>
> Short answer
>
> 1. Will hotplug work today in logical flat mode without selecting bigsmp?
>
> Yes, since we avoid broadcast on i386 IPI's with no_broadcast option.
>
> 2. Why use bigsmp then?
> There is no reason to do the same thing in two different ways. i.e using
> logical flat with no_broadcast=1, or use the bigsmp by default when hotplug cpu is
> enabled. IOW we wanted the handling consistent with what we do for x86_64, hence the
> decision to use bigsmp automatically when hotplug is enabled or
> we notice >8 CPUS.
Why not make it even more consistent and just use bigsmp mode by
default, even for X86_PC? X86_BIGSMP would be reduntant, then...
Pavel
--
Picture of sleeping (Linux) penguin wanted...
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