Linux-kernel mailing list archive 1999-23,: Re: zero-copy TCP fileserving

# Re: zero-copy TCP fileserving

Roman Zippel (zippel@fh-brandenburg.de)
Mon, 7 Jun 1999 16:12:08 +0200 (MET DST)

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Hi,

> All the useful research is on message passing. That is a different game to
> TCP. Most of it is not SMP related - SMP scaling means you can't use mmu
> tricks for this stuff. Cross cpu invalidates to COW pages kill you rather
> rapidly

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.

bye, Roman

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