[Ubuntu-BD] Incorrect number of cores detected.

[Tareq Siraj]

Hello everyone,
I have this Quad Quad-core machine running Hardy
x86_64. Unfortunately, its only detecting 8 cores out of 16 cores. I
tried a Fedora 8 x86_64 installation disk and did a cat /proc/cpuinfo
in a ternimal and it detected all 16 cores. Do I need to enable any
kernel flags when booting Hardy? Thanks in advance.

$ uname -a
Linux moriyama 2.6.24-19-generic #1 SMP Wed Aug 20 17:53:40 UTC 2008 x86_64 GNU/Linux

$ cat /proc/cpuinfo  | grep processor
processor    : 0
processor    : 1
processor    : 2
processor    : 3
processor    : 4
processor    : 5
processor    : 6
processor    : 7

$ sudo lshw -C cpu
[sudo] password for tsiraj: 
  *-cpu:0                 
       description: CPU
       product: Quad-Core AMD Opteron(tm) Processor 8354
       vendor: Advanced Micro Devices [AMD]
       physical id: 3
       bus info: cpu at 0
       version: 15.2.3
       serial: To Be Filled By O.E.M.
       slot: CPU 1
       size: 2200MHz
       capacity: 2200MHz
       width: 64 bits
       clock: 200MHz
      
capabilities: fpu fpu_exception wp vme de pse tsc msr pae mce cx8 apic
sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx
mmxext fxsr_opt pdpe1gb rdtscp x86-64 3dnowext 3dnow constant_tsc
rep_good pni cx16 popcnt lahf_lm cmp_legacy svm extapic cr8_legacy abm
sse4a misalignsse 3dnowprefetch osvw ibs
  *-cpu:1
       description: CPU
       product: Quad-Core AMD Opteron(tm) Processor 8354
       vendor: Advanced Micro Devices [AMD]
       physical id: 8
       bus info: cpu at 1
       version: 15.2.3
       serial: To Be Filled By O.E.M.
       slot: CPU 2
       size: 2200MHz
       capacity: 2200MHz
       width: 64 bits
       clock: 200MHz
      
capabilities: fpu fpu_exception wp vme de pse tsc msr pae mce cx8 apic
sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx
mmxext fxsr_opt pdpe1gb rdtscp x86-64 3dnowext 3dnow constant_tsc
rep_good pni cx16 popcnt lahf_lm cmp_legacy svm extapic cr8_legacy abm
sse4a misalignsse 3dnowprefetch osvw ibs
  *-cpu:2
       description: CPU
       product: (To Be Filled By O.E.M.)
       vendor: AMD
       physical id: 4
       bus info: cpu at 2
       version: 15.2.3
       serial: To Be Filled By O.E.M.
       slot: CPU 3
       size: 2200MHz
       capacity: 2200MHz
       clock: 200MHz
  *-cpu:3
       description: CPU
       product: (To Be Filled By O.E.M.)
       vendor: AMD
       physical id: 10
       bus info: cpu at 3
       version: 15.2.3
       serial: To Be Filled By O.E.M.
       slot: CPU 4
       size: 2200MHz
       capacity: 2200MHz
       clock: 200MHz
  *-cpu:4 UNCLAIMED
       physical id: 7
       bus info: cpu at 4
       version: 15.2.3
  <snip />
  *-cpu:14 UNCLAIMED
       physical id: 14
       bus info: cpu at 14
       version: 15.2.3

 
Regards,
Tareq Ahmed Siraj