Anthony Liguori wrote:
1) On TX, we vmsplice() from the sg buffer to one pipe. This will end up being vmsplice_to_pipe() in the kernel which is zero-copy.
That implies we do the MAC address switching in userspace (or that this is a point-to-point protocol, which severely limits its usefulness).
I think we can still have one-copy interguest networking if we have proper skb destructors; and since we need that for the more important guest->external copyless support, we basically get it for free (if delayed).
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