With which options? Standard tap (or tun?), or macvtap? The last test I did (macvtap to an external interface but none of the offload options), a gigabit used a

With which options? Standard tap (or tun?), or macvtap? The last test I did (macvtap to an external interface but none of the offload options), a gigabit used a lot of CPU, like around a whole CPU just copying data.