Re: HT CPU handling - 2.6.2

[Len Brown]

no.  the disabled flag is a reflection of wires inside the processor. 
You could pop the cap and ion-beam edit the die, or buy an HT-enabled
processor.  The later would be somewhat more cost effective;-)

cheers,
-Len

On Tue, 2004-02-10 at 01:47, Hod McWuff wrote:
> OK, the BIOS setting is disabled and cannot be changed, so the message
> won't get cleaned up that way. I could of course disable SMP in my
> kernel, but that really doesn't address anything.
> 
> What I'm wondering is, if the second "CPU" appears to exist but is
> merely marked disabled, who cares about the BIOS flag? Why couldn't the
> disable flag be cleared or ignored?
> 
> Couldn't the ACPI/APIC/SMP code just cope with the odd LAPIC ID somehow?
> 
> On Tue, 2004-02-10 at 00:37, Len Brown wrote:
> > Your BIOS is reporting the 2nd CPU as disabled, and telling us that it
> > has LAPIC id 0x81 = 129.  The ACPI table code prints this out and
> > registers the processor anyway, but that chokes because the LAPIC ID is
> > way out of bounds.
> > 
> > I'm thinking that ACPI should not register a processor that the BIOS
> > marked as disabled...
> > 
> > What should you do?  Apparently you've got an HT-enabled platform, BIOS,
> > and OS, but do not have an HT-enabled processor.  Your choices are to
> > disable HT in the BIOS SETUP to clean up this message, or plug in an
> > HT-enabled processor.
> > 
> > cheers,
> > -Len
> > 
> > On Mon, 2004-02-09 at 15:44, Hod McWuff wrote:
> > > I've got a 2.0A GHz P4, advertised as non-hyperthread, that seems to
> > > be
> > > reporting the presence of a second CPU. It also seems to be disabled
> > > by
> > > setting bit 7 of its ID. I've tried compiling with support for 130
> > > CPU's
> > > and nothing changed. What would have to be done to get this disabled
> > > CPU half back online?
> > > 
> > > Feb  9 04:45:03 pug ACPI: Local APIC address 0xfee00000
> > > Feb  9 04:45:03 pug ACPI: LAPIC (acpi_id[0x01] lapic_id[0x00] enabled)
> > > Feb  9 04:45:03 pug Processor #0 15:2 APIC version 20
> > > Feb  9 04:45:03 pug ACPI: LAPIC (acpi_id[0x02] lapic_id[0x81]
> > > disabled)
> > > Feb  9 04:45:03 pug Processor #129 invalid (max 16)
> > > Feb  9 04:45:03 pug ACPI: LAPIC_NMI (acpi_id[0x01] dfl dfl lint[0x1])
> > > Feb  9 04:45:03 pug ACPI: LAPIC_NMI (acpi_id[0x02] dfl dfl lint[0x1])
> > > 
> > > -
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