Looks like, in the case of ARP, DHCP,..  , packet is copied and sent from
vrouter to agent. Maybe, that kind of traffic's performance does not matter

Then, for regular traffic, on 1st packet processing, as I
understand, vrouter copies the packet header only and sends it over pkt0
to agent.  If that's the case, since it is still a copy(hence, expensive),
isn't it the 1st packet processing performance could be a bottleneck during
traffic rampup?
Any plan to move to shared memory between vrouter(userspace version) and
agent for packet (header) exchange?

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