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    SubjectRe: [PATCH] x86_64: Make NR_IRQS configurable in Kconfig
    Andrew Morton writes:

    > > Drawback would be some more TLB misses.
    > yup. On some (important) architectures - I'm not sure which architectures
    > do the bigpage-for-kernel trick.

    I looked at optimizing the per-cpu data accessors on PowerPC and only
    ever saw fractions of a percent change in overall performance, which
    says to me that we don't actually use per-cpu data all that much. So
    unless you make per-cpu data really really slow, I doubt that we'll
    see any significant performance difference.

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