troubleshooting Question

Ubuntu Intel Xeon E5420 quad core available only one core

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gla asked on
Linux
9 Comments1 Solution1201 ViewsLast Modified:
I had install an Ubuntu x64 9.04 and upgrade it to x64 10.04 but I have problem with cpu cores.
when I run cat /proc/cpuinfo
I take the following info:
processor      : 0
vendor_id      : GenuineIntel
cpu family      : 6
model            : 23
model name      : Intel(R) Xeon(R) CPU           E5420  @ 2.50GHz
stepping      : 6
cpu MHz            : 2500.000
cache size      : 6144 KB
physical id      : 0
siblings      : 1
core id            : 0
cpu cores      : 1
apicid            : 0
initial apicid      : 0
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 syscall nx lm constant_tsc up arch_perfmon pebs bts rep_good aperfmperf pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm dca sse4_1 lahf_lm tpr_shadow vnmi flexpriority
bogomips      : 4988.07
clflush size      : 64
cache_alignment      : 64
address sizes      : 38 bits physical, 48 bits virtual
power management:

why cpu cores is 1 and not 4?

also

the command

lshw -class cpu

return:
 *-cpu:0                
       description: CPU
       product: Intel(R) Xeon(R) CPU           E5420  @ 2.50GHz
       vendor: Intel Corp.
       physical id: 4
       bus info: cpu@0
       slot: LGA771
       size: 2500MHz
       capacity: 3330MHz
       width: 64 bits
       clock: 333MHz
       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 syscall nx x86-64 constant_tsc up arch_perfmon pebs bts rep_good aperfmperf pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm dca sse4_1 lahf_lm tpr_shadow vnmi flexpriority cpufreq
  *-cpu:1 DISABLED
       description: CPU [empty]
       vendor: Intel
       physical id: 5
       version: 0000000000000000000000000000000000000000000000000000000000000000
       slot: LGA771
  *-cpu:2 DISABLED
       description: CPU [empty]
       vendor: Intel
       physical id: 6
       version: 0000000000000000000000000000000000000000000000000000000000000000
       slot: LGA771
  *-cpu:3 DISABLED
       description: CPU [empty]
       vendor: Intel
       physical id: 7
       version: 0000000000000000000000000000000000000000000000000000000000000000
       slot: LGA771

any idea?

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