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  1. #1

    Intel 6 core Xeon X5680 on Linux

    I ran a dual Intel Xeon X5680 on a recent kernel and in procinfo it shows up as 4 cores/siblings per chip for a total of 8 cpus.

    This is a surprise since the 5680 has 6 cores per chip, and 2 threads per core.

    In contrast on another box with 4 core/2 thread Xeon X5500's procinfo shows 4 cores, 8 siblings per chip for a total 16 cpus.

    Any idea whats going on here?

  2. #2
    Linux Guru Segfault's Avatar
    Join Date
    Jun 2008
    The number of CPUs supported by I given kernel can be set in kernel configuration. If it's set to four - four cores will show up, and so on.

  3. #3
    Linux Guru Rubberman's Avatar
    Join Date
    Apr 2009
    I can be found either 40 miles west of Chicago, in Chicago, or in a galaxy far, far away.
    It also depends upon how your BIOS is configured. It may not have hyperthreading turned on, etc.
    Sometimes, real fast is almost as good as real time.
    Just remember, Semper Gumbi - always be flexible!

  4. $spacer_open
  5. #4
    My mistake, I was testing with the live 32 bit cd. With a 64 bit kernel I get the full 24 cpu's.

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