linux-kernel - dual Xeon hyperthread system only showing up as 2 cpus

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Message-ID: <46C3897A.6060106@nortel.com>
Date:	Wed, 15 Aug 2007 17:17:14 -0600
From:	"Chris Friesen" <cfriesen@...tel.com>
To:	linux-kernel@...r.kernel.org
Subject: dual Xeon hyperthread system only showing up as 2 cpus


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


The 2.6.14 config file includes:
CONFIG_MPENTIUM4=y
CONFIG_X86_CMPXCHG=y
CONFIG_X86_XADD=y
CONFIG_X86_L1_CACHE_SHIFT=7
CONFIG_RWSEM_XCHGADD_ALGORITHM=y
CONFIG_GENERIC_CALIBRATE_DELAY=y
CONFIG_X86_WP_WORKS_OK=y
CONFIG_X86_INVLPG=y
CONFIG_X86_BSWAP=y
CONFIG_X86_POPAD_OK=y
CONFIG_X86_GOOD_APIC=y
CONFIG_X86_INTEL_USERCOPY=y
CONFIG_X86_USE_PPRO_CHECKSUM=y
# CONFIG_HPET_TIMER is not set
CONFIG_SMP=y
CONFIG_NR_CPUS=4
# CONFIG_SCHED_SMT is not set
CONFIG_PREEMPT_NONE=y
CONFIG_PREEMPT_BKL=y
CONFIG_X86_LOCAL_APIC=y
CONFIG_X86_IO_APIC=y
CONFIG_X86_TSC=y
CONFIG_X86_MCE=y
CONFIG_X86_MCE_NONFATAL=y
CONFIG_X86_MCE_P4THERMAL=y
CONFIG_MICROCODE=y
CONFIG_X86_MSR=y
CONFIG_X86_CPUID=y


Anyone have any ideas?

Chris


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