* Siddha, Suresh B <[email protected]> wrote:
> On Mon, Nov 13, 2006 at 07:42:56PM +0100, Ingo Molnar wrote:
> > * Siddha, Suresh B <[email protected]> wrote:
> > > Not really. That chipset belongs to a MP platform and with your
> > > proposed patch, we will endup using clustered APIC mode and will hit
> > > the issue(in the presence of cpu hotplug) mentioned in that URL.
> >
> > hm, why does it end up in clustered mode? Cluster mode should only
> > trigger if the APIC IDs go beyond 16.
>
> go beyond '8' not 16. With Dual-core+HT these MP platforms will have
> 16 logical cpus.
yes - then the APIC ids will go beyond 15.
> > but i'd be fine with never going into cluster mode, instead always
> > using physical flat mode when having more than 8 APICs (independent
> > of the presence of CPU hotplug). On small systems, logical flat mode
> > is what is the best-tested variant (it's also slightly faster).
>
> Ok.
ok, that's really good. Is there any 'weird' platform that you are aware
of that absolutely needs clustered APIC mode (because it has no physical
delivery mode or something)?
Ingo
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