Stefan Hajnoczi [off-list ref] writes:

On Thu, May 30, 2013 at 7:23 AM, Rusty Russell [off-list ref] wrote:

quoted

On the receive side, what can we do better than readv?  If we need to
return to userspace to tell the guest that we've got a new packet, we
don't win on latency.  We might reduce syscall overhead with a
multi-dimensional readv to read multiple packets at once?

Sounds like recvmmsg(2).

Wow... the future is here, today!

Thanks,
Rusty.