On Sun, Feb 12, 2006 at 03:57:06PM -0500, Josef Sipek wrote:
> On Sun, Feb 12, 2006 at 08:59:26PM +0100, Tomas M wrote:
> > When I compile the kernel without ACPI at all, then it doesn't behaves
> > like a SMP kernel - only one processor is shown in /proc/cpuinfo and
> > the system works perfectly. It seems to me like it's not even
> > possible to compile kernel with SMP support without ACPI, but I don't
> > understand these things much, I am sorry.
I think the issue here is that _hyperthreading_ requires ACPI.
> There is ACPI (power management) and APIC (interrupt controller). Some
> systems require both, while (mostly older ones) others require only
> APIC.
And some systems don't cope well with any of it. I have to explicitly
disable ACPI and APIC to get my dual dual-core Opteron to boot, but it
still has SMP enabled and all four cores appear in /proc/cpuinfo.
-Dave Dodge
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