Messages in this thread | | | Date | Thu, 30 Mar 2006 15:17:26 +0200 | From | Pavel Machek <> | Subject | Re: [rfc] fix Kconfig, hotplug_cpu is needed for swsusp |
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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
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