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* x86_64: up to 255 or 256 CPUs?
@ 2007-01-11  7:01 Adrian Bunk
  0 siblings, 0 replies; 4+ messages in thread
From: Adrian Bunk @ 2007-01-11  7:01 UTC (permalink / raw)
  To: ak; +Cc: discuss, linux-kernel

Quoting arch/x86_64/Kconfig:

<--  snip  -->

...
config NR_CPUS
        int "Maximum number of CPUs (2-256)"
        range 2 255
...


<--  snip  -->

cu
Adrian

-- 

       "Is there not promise of rain?" Ling Tan asked suddenly out
        of the darkness. There had been need of rain for many days.
       "Only a promise," Lao Er said.
                                       Pearl S. Buck - Dragon Seed


^ permalink raw reply	[flat|nested] 4+ messages in thread
* Re: x86_64: up to 255 or 256 CPUs?
  2007-02-20  0:42 ` William Lee Irwin III
@ 2007-02-20  9:35   ` Andi Kleen
  0 siblings, 0 replies; 4+ messages in thread
From: Andi Kleen @ 2007-02-20  9:35 UTC (permalink / raw)
  To: William Lee Irwin III; +Cc: Adrian Bunk, discuss, linux-kernel

On Tuesday 20 February 2007 01:42, William Lee Irwin III wrote:
> On Tue, Feb 20, 2007 at 01:06:47AM +0100, Adrian Bunk wrote:
> > Quoting arch/x86_64/Kconfig:
> > <--  snip  -->
> > ...
> > config NR_CPUS
> >         int "Maximum number of CPUs (2-256)"
> >         range 2 255
> > ...
> > <--  snip  -->
> > cu
> > Adrian
> 
> The broadcast APIC ID clashes with the 256th cpu.

Yes 255 is theory. But we don't know if it actually works anyways because
it has been never tested.

-Andi

^ permalink raw reply	[flat|nested] 4+ messages in thread
* Re: x86_64: up to 255 or 256 CPUs?
  2007-02-20  0:06 Adrian Bunk
@ 2007-02-20  0:42 ` William Lee Irwin III
  2007-02-20  9:35   ` Andi Kleen
  0 siblings, 1 reply; 4+ messages in thread
From: William Lee Irwin III @ 2007-02-20  0:42 UTC (permalink / raw)
  To: Adrian Bunk; +Cc: ak, discuss, linux-kernel

On Tue, Feb 20, 2007 at 01:06:47AM +0100, Adrian Bunk wrote:
> Quoting arch/x86_64/Kconfig:
> <--  snip  -->
> ...
> config NR_CPUS
>         int "Maximum number of CPUs (2-256)"
>         range 2 255
> ...
> <--  snip  -->
> cu
> Adrian

The broadcast APIC ID clashes with the 256th cpu.


-- wli

^ permalink raw reply	[flat|nested] 4+ messages in thread
* x86_64: up to 255 or 256 CPUs?
@ 2007-02-20  0:06 Adrian Bunk
  2007-02-20  0:42 ` William Lee Irwin III
  0 siblings, 1 reply; 4+ messages in thread
From: Adrian Bunk @ 2007-02-20  0:06 UTC (permalink / raw)
  To: ak; +Cc: discuss, linux-kernel

Quoting arch/x86_64/Kconfig:

<--  snip  -->

...
config NR_CPUS
        int "Maximum number of CPUs (2-256)"
        range 2 255
...


<--  snip  -->

cu
Adrian

-- 

       "Is there not promise of rain?" Ling Tan asked suddenly out
        of the darkness. There had been need of rain for many days.
       "Only a promise," Lao Er said.
                                       Pearl S. Buck - Dragon Seed


^ permalink raw reply	[flat|nested] 4+ messages in thread
end of thread, other threads:[~2007-02-20  9:41 UTC | newest]

Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2007-01-11  7:01 x86_64: up to 255 or 256 CPUs? Adrian Bunk
2007-02-20  0:06 Adrian Bunk
2007-02-20  0:42 ` William Lee Irwin III
2007-02-20  9:35   ` Andi Kleen

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