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SubjectRe: 2.6.19-rc1: x86_64 slowdown in lmbench's fork

> So unless there is some other array that is sized by NR_IRQs
> in the context switch path which could account for this in
> other ways. It looks like you just got unlucky.

TLB/cache profiling data might be useful?
My bet would be more on cache effects.

> The only hypothesis that I can seem to come up with is that maybe
> you are getting an extra tlb now that you didn't use to.
> I think the per cpu area is covered by huge pages but maybe not.

It should be.

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