CPU summary issues with AMD Opteron

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2013-09-03
2013-09-03
  • Simon Matter

    Simon Matter - 2013-09-03

    I've just looked at some start screen of nmon on different servers running CentOS 5 and 6. Some numbers are shown wrong but I don't understand exactly why because I don't unterstand /proc/cpuinfo in detail. That's what I get on 3 servers:

    Intel, 1 CPU with 4 Cores:
    │ x86 GenuineIntel Intel(R) Xeon(R) CPU E5405 @ 2.00GHz │
    │ x86 MHz=1994.997 bogomips=3989.95 │
    │ x86 ProcessorChips=1 PhyscalCores=4 │
    │ x86 Hyperthreads =0 VirtualCPUs =4

    All is correct.

    AMD, 4 CPUs with 12 Cores each:
    │ x86 AuthenticAMD AMD Opteron(tm) Processor 6174 │
    │ x86 MHz=800.000 bogomips=4389.17 │
    │ x86 ProcessorChips=1 PhyscalCores=12 │
    │ x86 Hyperthreads =0 VirtualCPUs =48

    In reality this server has:
    4x CPU-Modules (sockets) with 2 dies each, with 1x 6-core-modules each = 48 Cores
    No Hyperthreading.

    AMD, 4 CPUs with 16 Cores each:
    │ x86 AuthenticAMD AMD Opteron(tm) Processor 6282 SE │
    │ x86 MHz=1400.000 bogomips=5190.09 │
    │ x86 ProcessorChips=1 PhyscalCores=8 │
    │ x86 Hyperthreads =2 VirtualCPUs =64

    In reality this server has:
    4x CPU-Modules (sockets) with 2 dies each, with 4x 2-core-modules each = 64 Cores
    No Hyperthreading.

    Unfortunately the logic to decode the entries in /proc/cpuinfo (and different versions of them) is really complex and I didn't manage to find the correct formula.

    Regards,
    Simon

     
  • Simon Matter

    Simon Matter - 2013-09-03

    I'll attach /proc/cpuinfo of AMD 6282

     
    Last edit: Simon Matter 2013-09-03
  • Simon Matter

    Simon Matter - 2013-09-03

    and AMD 6174

     

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