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Thread: Only 1 CPU core on Dualcore

  1. #1
    Join Date
    Apr 2006
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    Ubuntu 9.04 Jaunty Jackalope

    [Fixed!] Only 1 CPU core on Dualcore

    Hello everyone,

    I can only see one CPU core in my gnome-system-monitor. Also I notice my system is slower than an identical system where both cores are recognized. I have been reading this thread and got similar results on the executed commands. However, the fix (acpi=off) did not work for me.

    I will show the outputs of some commands:

    uname -a:
    Code:
    Linux taz-desktop 2.6.28-11-generic #42-Ubuntu SMP Fri Apr 17 01:57:59 UTC 2009 i686 GNU/Linux
    cat /proc/cpuinfo:
    Code:
    processor	: 0
    vendor_id	: GenuineIntel
    cpu family	: 6
    model		: 15
    model name	: Intel(R) Core(TM)2 CPU          4400  @ 2.00GHz
    stepping	: 2
    cpu MHz		: 2000.201
    cache size	: 2048 KB
    physical id	: 0
    siblings	: 1
    core id		: 0
    cpu cores	: 1
    apicid		: 0
    initial apicid	: 0
    fdiv_bug	: no
    hlt_bug		: no
    f00f_bug	: no
    coma_bug	: no
    fpu		: yes
    fpu_exception	: yes
    cpuid level	: 10
    wp		: yes
    flags		: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx lm constant_tsc up arch_perfmon pebs bts pni dtes64 monitor ds_cpl est tm2 ssse3 cx16 xtpr pdcm lahf_lm
    bogomips	: 4000.40
    clflush size	: 64
    power management:
    mpstat -P ALL:
    Code:
    Linux 2.6.28-11-generic (taz-desktop) 	05/01/2009 	_i686_	(1 CPU)
    
    12:30:31 PM  CPU    %usr   %nice    %sys %iowait    %irq   %soft  %steal  %guest   %idle
    12:30:31 PM  all   12.38    0.59    6.98    6.82    0.45    0.43    0.00    0.00   72.37
    12:30:31 PM    0   12.38    0.59    6.98    6.82    0.45    0.43    0.00    0.00   72.37
    dmesg | grep -i cpu:
    Code:
    [    0.000000] Initializing cgroup subsys cpuset
    [    0.000000] Initializing cgroup subsys cpu
    [    0.000000] KERNEL supported cpus:
    [    0.000000]   Transmeta TransmetaCPU
    [    0.000000] SMP: Allowing 1 CPUs, 0 hotplug CPUs
    [    0.000000] PERCPU: Allocating 45056 bytes of per cpu data
    [    0.000000] NR_CPUS: 64, nr_cpu_ids: 1, nr_node_ids 1
    [    0.000000] Initializing CPU#0
    [    0.004000] SLUB: Genslabs=12, HWalign=64, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
    [    0.004291] Initializing cgroup subsys cpuacct
    [    0.004317] CPU: L1 I cache: 32K, L1 D cache: 32K
    [    0.004320] CPU: L2 cache: 2048K
    [    0.004323] CPU: Physical Processor ID: 0
    [    0.004325] CPU: Processor Core ID: 0
    [    0.104457] weird, boot CPU (#0) not listedby the BIOS.
    [    0.212366] Brought up 1 CPUs
    [    0.212386] CPU0 attaching NULL sched-domain.
    [    0.847445] cpufreq: No nForce2 chipset.
    [    7.894894] cpuidle: using governor ladder
    [    7.894895] cpuidle: using governor menu
    sudo lshw -class cpu:
    Code:
      *-cpu                   
           description: CPU
           product: Intel(R) Core(TM)2 CPU          4400  @ 2.00GHz
           vendor: Intel Corp.
           physical id: 400
           bus info: cpu@0
           version: 6.15.2
           serial: 0000-06F2-0000-0000-0000-0000
           slot: Microprocessor
           size: 2GHz
           width: 64 bits
           clock: 800MHz
           capabilities: fpu fpu_exception wp vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx x86-64 constant_tsc up arch_perfmon pebs bts pni dtes64 monitor ds_cpl est tm2 ssse3 cx16 xtpr pdcm lahf_lm
           configuration: id=0
         *-logicalcpu:0
              description: Logical CPU
              physical id: 0.1
              width: 64 bits
              capabilities: logical
         *-logicalcpu:1
              description: Logical CPU
              physical id: 0.2
              width: 64 bits
              capabilities: logical
    Finally, my boot entry in lilo.conf:
    Code:
    image=/boot/vmlinuz-2.6.28-11-generic
            label="NA 2.6.28-11"
            append=" acpi=off noapic pci=nomsi pnpbios=off ro quiet splash"
            initrd=/boot/initrd.img-2.6.28-11-generic
            read-only
    Please, who can help me?
    Last edited by LucidTaZ; May 1st, 2009 at 02:21 PM. Reason: Fixed!

  2. #2
    Join Date
    Apr 2006
    Location
    Netherlands
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    Ubuntu 9.04 Jaunty Jackalope

    Re: Only 1 CPU core on Dualcore

    I should add:
    I use a Dell Optiplex 320i. All bios settings are good. (I checked them against my friend's bios where everything works fine)

  3. #3
    Join Date
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    Re: Only 1 CPU core on Dualcore

    I seem to have fixed this. This is what I did:

    I changed my boot entry from
    Code:
    image=/boot/vmlinuz-2.6.28-11-generic
            label="Linux 2.6.28-11"
            append=" acpi=off noapic pci=nomsi pnpbios=off ro quiet splash"
            initrd=/boot/initrd.img-2.6.28-11-generic
            read-only
    To
    Code:
    image=/boot/vmlinuz-2.6.28-11-generic
    	label="Linux 2.6.28-11"
            append=" pci=nomsi pnpbios=off ro quiet splash"
            initrd=/boot/initrd.img-2.6.28-11-generic
            read-only
    I don't really understand why it works, as I had to add "acpi=off" after the Jaunty upgrade to even make Ubuntu start properly. But right now my gnome-system-monitor shows two cpu's again!

  4. #4
    Join Date
    Jul 2007
    Beans
    11

    Re: Only 1 CPU core on Dualcore

    I have triple core AMD Phenom and there is only one core after I added pci=nomsi (to try to eliminate random hanging, but looks like it's just xorg freeze)

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