On Mon, Aug 14, 2006 at 04:35:30PM +0400, Evgeniy Polyakov (johnpol@2ka.mipt.ru) wrote:

quoted

I'm still not clear on how you want to do this, only the trivial case of
a sniffer was mentioned by you. To be able to do true zero-copy receive
each packet will have to have its own page(s). Simply because you do not
know the destination before you receive it, the packet could end up
going to a whole different socket that the prev/next. As soon as you
start packing multiple packets on 1 page, you've lost the zero-copy
receive game.

Userspace can sak for next packet and pointer to the new location will
be removed.

... returned.

The same will be applied for sending support - userspace will request
new packet with given size and pointer to some chunk inside mapped area
will be returned.

-- 
	Evgeniy Polyakov