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.
>
> 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.
thanks,
suresh
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