lkml.org 
[lkml]   [2007]   [Aug]   [15]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: dual Xeon hyperthread system only showing up as 2 cpus
Chris Friesen wrote:
>
> Hi all,
>
> I've got a system that has two hyperthread-capable Xeons. If I boot it
> with 2.6.10 it shows up as 4 cpus, but with 2.6.14 it only shows 2 cpus.
>
> The relevent boot logs are:
>
> 2.6.10:
>
> DMI 2.3 present.
> ACPI: LAPIC (acpi_id[0x01] lapic_id[0x00] enabled)
> Processor #0 15:2 APIC version 20
> ACPI: LAPIC (acpi_id[0x02] lapic_id[0x06] enabled)
> Processor #6 15:2 APIC version 20
> ACPI: LAPIC (acpi_id[0x03] lapic_id[0x01] enabled)
> Processor #1 15:2 APIC version 20
> ACPI: LAPIC (acpi_id[0x04] lapic_id[0x07] enabled)
> Processor #7 15:2 APIC version 20
> Using ACPI for processor (LAPIC) configuration information
> Intel MultiProcessor Specification v1.4
> Virtual Wire compatibility mode.
> <snip>
> Processors: 4
>
>
> 2.6.14:
>
> DMI 2.3 present.
> Intel MultiProcessor Specification v1.4
> Virtual Wire compatibility mode.
> OEM ID: INTEL Product ID: KingsCanyonC APIC at: 0xFEE00000
> Processor #0 15:2 APIC version 20
> Processor #6 15:2 APIC version 20
> <snip>
> Processors: 2

You snipped the important part of the log. It's not using ACPI in 2.6.14
for some reason, which you need for HT to be detected. Either you didn't
configure it in or it's failed to enable somehow. Please post the entire
dmesg.

--
Robert Hancock Saskatoon, SK, Canada
To email, remove "nospam" from hancockr@nospamshaw.ca
Home Page: http://www.roberthancock.com/

-
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: 2007-08-16 01:39    [W:0.027 / U:0.704 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site