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    SubjectRe: 2.6.27rc1 cannot boot more than 8CPUs

    * Jeff Chua <jeff.chua.linux@gmail.com> wrote:

    >
    > On Wed, Aug 6, 2008 at 5:42 PM, Jeff Chua <jeff.chua.linux@gmail.com>
    > wrote:
    >>>> CONFIG_X86_GENERICARCH=y
    >>>> CONFIG_X86_BIGSMP=y
    >>>> 8 more cpu need bigsmp mode.
    >
    >> Just found it under " Subarchitecture Type (Generic architecture)",
    >> and then it shows the CONFIG_X86_BIGSMP option.
    >
    > It works. Booted with 16CPUs. 32GB RAM.
    >
    > CPU0 L7345 1.86GHz 0C
    > CPU1 L7345 1.86GHz 0C
    > CPU2 L7345 1.86GHz 0C
    > CPU3 L7345 1.86GHz 0C
    > CPU4 L7345 1.86GHz 0C
    > CPU5 L7345 1.86GHz 0C
    > CPU6 L7345 1.86GHz 0C
    > CPU7 L7345 1.86GHz 0C
    > CPU8 L7345 1.86GHz 0C
    > CPU9 L7345 1.86GHz 0C
    > CPU10 L7345 1.86GHz 0C
    > CPU11 L7345 1.86GHz 0C
    > CPU12 L7345 1.86GHz 0C
    > CPU13 L7345 1.86GHz 0C
    > CPU14 L7345 1.86GHz 0C
    > CPU15 L7345 1.86GHz 0C
    >
    >
    > So, but setting the config not obvious. And should CONFIG_X86_PC be
    > considered as well as CONFIG_X86_GENERICARCH?
    >
    > With CONFIG_X86_PC, I can set CONFIG_SPARSEMEM=y.
    >
    > With CONFIG_X86_GENERICARCH, CONFIG_SPARSEMEM depends on CONFIG_NUMA.
    >
    > I'm using the patch below to enable sparsemem instead of flatmem, but
    > don't know what impact it has. System booted and running.
    >
    > It would be nice to automatically default CONFIG_X86_BIGSMP with CPUs
    > > 8. But I don't know to do that.

    thanks, applied.

    i'm wondering, does with that patch applied a working 2.6.26 .config if
    put through 'make oldconfig' boot fine on your box now? Any make
    oldconfig breakage is a regression we want to fix. We want upgrades
    between kernel versions to be seemless and complete.

    Ingo


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