linux-kernel - Re: x86_64: up to 255 or 256 CPUs?

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Message-Id: <200702201035.38874.ak@suse.de>
Date:	Tue, 20 Feb 2007 10:35:38 +0100
From:	Andi Kleen <ak@...e.de>
To:	William Lee Irwin III <wli@...omorphy.com>
Cc:	Adrian Bunk <bunk@...sta.de>, discuss@...-64.org,
	linux-kernel@...r.kernel.org
Subject: Re: x86_64: up to 255 or 256 CPUs?

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
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