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    SubjectRe: [PATCH 00/10] x86: Reduce memory and intra-node effects with large count NR_CPUs

    * travis@sgi.com <travis@sgi.com> wrote:

    > This patchset addresses the kernel bloat that occurs when NR_CPUS is
    > increased. The memory numbers below are with NR_CPUS = 1024 which I've
    > been testing (4 and 32 real processors, the rest "possible" using the
    > additional_cpus start option.) These changes are all specific to the
    > x86 architecture, non-arch specific changes will follow.

    thanks, i'll try this patchset in x86.git.

    > 32cpus 1kcpus-before 1kcpus-after
    > 7172678 Total +23314404 Total -147590 Total

    1kcpus-after means it's +23314404-147590, i.e. +23166814? (i.e. a 0.6%
    reduction of the bloat?)

    i.e. we've got ~22K bloat per CPU - which is not bad, but because it's a
    static component, it hurts smaller boxes. For distributors to enable
    CONFIG_NR_CPU=1024 by default i guess that bloat has to drop below 1-2K
    per CPU :-/ [that would still mean 1-2MB total bloat but that's much
    more acceptable than 23MB]

    Ingo


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