Messages in this thread |  | | | Date | Tue, 8 Aug 2006 15:09:34 +1000 | | From | Paul Mackerras <> | | Subject | Re: [PATCH] x86_64: Make NR_IRQS configurable in Kconfig |
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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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