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SubjectRe: Gigabit Linux Server Bottlenecks
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> Yes, this works fine for UDP, but you can't do TCP this way without COW VM 
> support for scatter skbufs, because TCP needs to buffer data until it has been
> acknowledged. Even then, you need the application to behave properly and not
> touch anything in the same page as the output data until an ACK is received.
> This is easy enough to hack into high bandwidth servers, like ftp or rcp, and
> that is mostly the only place you will need it.

There is one other case its really easy to support - sendfile().


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