Re: zero-copy TCP fileserving

Alan Cox (alan@lxorguk.ukuu.org.uk)
Mon, 7 Jun 1999 15:45:03 +0100 (BST)

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> That's a problem on intel, e.g. ppc can invalidate pte's on other
> cpu with a few instructions and doesn't need such a horrible
> smp_flush_tlb(), so zerocopy is possible, but not with intel/smp.

You might want to benchmark the overhead of that. You have to invalidate
and be sure the other cpu invalidation is complete before continuing. I don't
doubt it can be way faster than intel, but I doubt its that cheap.

Anyone have datasheet figures ?

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