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    SubjectRe: /proc/cpuinfo shows only 2 processors on dual P4-Xeon system
    Date
    Does your system BIOS have an option to enable/disable HT support?  If it 
    does, make sure it is enabled.

    I would have expected to see 4 ioapics, but hmm, I don't really know.

    -Andrew Theurer

    On Wednesday 26 February 2003 12:37, Andrew Walrond wrote:
    > Grover, Andrew wrote:
    > > Enable the ACPI "CPU enumeration only" option.
    >
    > Ok - just tried that, but I still see only two processors in cpuinfo
    >
    > Any ideas?
    >
    > Relevant part of dmesg:
    >
    > Using ACPI for processor (LAPIC) configuration information
    > KERN_INFO Intel MultiProcessor Specification v1.4
    > Virtual Wire compatibility mode.
    > OEM ID: ASUS Product ID: PROD00000000 APIC at: 0xFEE00000
    > I/O APIC #8 Version 17 at 0xFEC00000.
    > I/O APIC #9 Version 17 at 0xFEC01000.
    > I/O APIC #10 Version 17 at 0xFEC02000.
    > Enabling APIC mode: Flat. Using 3 I/O APICs
    > Processors: 4
    > Building zonelist for node : 0
    > Kernel command line: ro root=/dev/nfs ip=dhcp console=ttyS0,115200n8
    > console=tty0 init=/boot/boot.sh
    > Initializing CPU#0
    > PID hash table entries: 4096 (order 12: 32768 bytes)
    > Detected 2591.629 MHz processor.
    > Calibrating delay loop... 5111.80 BogoMIPS
    > Memory: 3100936k/4194304k available (1348k kernel code, 43644k reserved,
    > 310k data, 304k init, 2228200k highmem)
    > Dentry cache hash table entries: 524288 (order: 10, 4194304 bytes)
    > Inode-cache hash table entries: 262144 (order: 9, 2097152 bytes)
    > Mount-cache hash table entries: 512 (order: 0, 4096 bytes)
    > -> /dev
    > -> /dev/console
    > -> /root
    > CPU: Trace cache: 12K uops, L1 D cache: 8K
    > CPU: L2 cache: 512K
    > CPU: Physical Processor ID: 0
    > CPU: After generic, caps: bfebfbff 00000000 00000000 00000000
    > Intel machine check architecture supported.
    > Intel machine check reporting enabled on CPU#0.
    > CPU#0: Intel P4/Xeon Extended MCE MSRs (12) available
    > CPU#0: Thermal monitoring enabled
    > Machine check exception polling timer started.
    > Enabling fast FPU save and restore... done.
    > Enabling unmasked SIMD FPU exception support... done.
    > Checking 'hlt' instruction... OK.
    > POSIX conformance testing by UNIFIX
    > CPU0: Intel(R) Xeon(TM) CPU 2.60GHz stepping 07
    > per-CPU timeslice cutoff: 1462.69 usecs.
    > task migration cache decay timeout: 2 msecs.
    > enabled ExtINT on CPU#0
    > ESR value before enabling vector: 00000000
    > ESR value after enabling vector: 00000000
    > Booting processor 1/1 eip 2000
    > Initializing CPU#1
    > masked ExtINT on CPU#1
    > ESR value before enabling vector: 00000000
    > ESR value after enabling vector: 00000000
    > Calibrating delay loop... 5177.34 BogoMIPS
    > CPU: Trace cache: 12K uops, L1 D cache: 8K
    > CPU: L2 cache: 512K
    > CPU: Physical Processor ID: 0
    > CPU: After generic, caps: bfebfbff 00000000 00000000 00000000
    > Intel machine check architecture supported.
    > Intel machine check reporting enabled on CPU#1.
    > CPU#1: Intel P4/Xeon Extended MCE MSRs (12) available
    > CPU#1: Thermal monitoring enabled
    > CPU1: Intel(R) Xeon(TM) CPU 2.60GHz stepping 07
    > Total of 2 processors activated (10289.15 BogoMIPS).
    >
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