Re: [PATCH][2.4] generic support for systems with more than 8 CP Us (2/2)

[James Cleverdon <jamesclv@us.ibm.com>]

On Sunday 22 December 2002 01:36 pm, Protasevich, Natalie wrote:
[ Snip! ]

>
> >In the last patch from Venkatesh there was a > 8CPUs option ... that
> >seems like a direct correlation to clustered apic support to me ...
> >maybe we could just switch on CONFIG_X86_CLUSTERED_APIC directly and
> >bypass CONFIG_X86_MANY_CPU? The menu text could stay the same (less
> >confusing for users than asking them about apic modes) ...
>
> Maybe, for other systems MANY_CPU criteria would make sense, but it won't
> work for us: on ES7000s with Fosters/Gallatins, we can run 1 to 32 CPUs and
> have to be in flat clustered mode in any case - whether we run 2 do 32 of

What is "flat clustered"?  Has Intel cooked up yet another APIC operating 
mode?   8^)   As far as I knew, the flat and clustered modes were mutually 
exclusive, based on the value in the DFR.

> them... This is also true for Cascades running on hierarchical cluster
> (logical). Our APIC ID's are hard-coded topologically in the BIOS, so we
> could run 2 processors on the high end of topology, with high APIC IDs. We
> couldn't get around using just ID's (not the EID's), because hardware needs
> the full CPU ID address to deliver IPIs.
>
> >M.

-- 
James Cleverdon
IBM xSeries Linux Solutions
{jamesclv(Unix, preferred), cleverdj(Notes)} at us dot ibm dot com