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    SubjectRe: 2.6.27rc1 cannot boot more than 8CPUs
    Jeff Chua wrote:
    > I've a Dell R900 with 4 quad-core Xeon processors (total 16CPUs), but
    > can only managed to boot up with CONFIG_NR_CPUS=8. Setting
    > CONFIG_NR_CPUS=16 causes the kernel to hang while booting.

    You could try booting CONFIG_NR_CPUS=16 with maxcpus=8 (kernel command line
    option).

    If it boots you can then try bringing the rest of the cpus online manually
    echo 1 > /sys/devices/system/cpu/cpu8/online
    ...
    echo 1 > /sys/devices/system/cpu/cpu15/online

    Might get a better OOPS/BUG_ON/etc report.

    Max


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