Re: zero-copy TCP fileserving

Alan Cox (alan@lxorguk.ukuu.org.uk)
Fri, 4 Jun 1999 00:14:25 +0100 (BST)

> but, why should the copy even occur? there is easily enough research
> lingering around these days to show the zero copying is good (Unet for
> instance as well as ExoKernel) these were direct access to user space
> without copies, but the same philosophy can hold for kernel space.

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

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