lkml.org 
[lkml]   [2006]   [Mar]   [2]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: 2.6.16rc5 'found' an extra CPU.
On Wed, Mar 01, 2006 at 09:49:53PM -0800, Brown, Len wrote:
>
> >sysfs gets it right.
> >
> >(23:11:01:davej@nemesis:~)$ ls /sys/devices/system/cpu/
> >cpu0/ cpu1/
> >(23:11:07:davej@nemesis:~)$ ls /proc/acpi/processor/
> >CPU1/ CPU2/ CPU3/
>
> This is because the BIOS has three "Processor" objects in the DSDT.
>

I have a dual core + HT platform. I disabled HT to have the same situation
as Dave.

ACPI DSDT dump shows 4 objects in \_PR scope as below.

Scope (\_PR)
{
Processor (CPU0, 0x01, 0x00000410, 0x06) {}
Processor (CPU1, 0x02, 0x00000410, 0x06) {}
Processor (CPU2, 0x03, 0x00000410, 0x06) {}
Processor (CPU3, 0x04, 0x00000410, 0x06) {}
}
Only 2 are marked enabled in the ACPI MADT..

From boot log

ACPI: LAPIC (acpi_id[0x01] lapic_id[0x00] enabled)
Processor #0 15:4 APIC version 20
ACPI: LAPIC (acpi_id[0x03] lapic_id[0x02] enabled)
Processor #2 15:4 APIC version 20
ACPI: LAPIC (acpi_id[0x02] lapic_id[0x01] disabled)
ACPI: LAPIC (acpi_id[0x04] lapic_id[0x03] disabled)

But proc/acpi/processor also lists just 2 entries.

[root@araj-sfield-2 tmp]# ls /proc/acpi/processor/
CPU0 CPU2

I suspect that the BIOS is goofy and sending a valid acpiid when we try
to evaluate the processor object.

Could you see what comes out of the /proc/acpi/processor/CPUx/info for all the
3 listed in your system?

Also if you can send DSDT dump just to look over.

Cheers,
ashok
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2006-03-02 17:33    [W:0.175 / U:0.448 seconds]
©2003-2014 Jasper Spaans. Advertise on this site