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SubjectRe: [Question] Explanation of zero-copy networking
On Mon, 7 May 2001, Alan Cox wrote:

> > documented so far) detailed description of the newly
> > implemented zero-copy mechanisms in the network-stack.
> > We are interested in how to use it (changed network-API?)
> > and also in the internal architecture.
>
> It is built around sendfile. Trying to do zero copy on pages with user space
> mappings get so horribly non pretty it is better to build the API from the
> physical side of things.

so there's still single copy for write() of a mmap()ed page?

since i'm naive about the high-end databases -- do they have a mechanism
to access zero-copy? i suppose sendfile() on a raw device fd would
work... nice.

-dean

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