Comment 2 for bug 1639273

[ovs version]
trusty-liberty: 2.4.1-0ubuntu0.15.10.1~cloud0
xenial-mitaka: 2.5.0

[differ]
# dp flow (trusty-liberty) system@ovs-system: lookups: hit:21292 missed:2806 lost:0
        flows: 0
        masks: hit:38067 total:0 hit/pkt:1.58
        port 0: ovs-system (internal)
        port 1: br-int (internal)
        port 2: br-ex (internal)
        port 3: br-tun (internal)
        port 4: gre_sys (gre)
        port 5: br-data (internal)
        port 6: qvo07e7496c-a1
        port 7: qvo91feef0f-f9
        port 8: qvo06e27c00-43
        port 9: qvo57a80236-fc

tunnel(tun_id=0x5,src=10.5.1.254,dst=10.5.2.1,ttl=64,flags(-df-csum+key)),in_port(4),skb_mark(0),eth(src=fa:16:3e:fd:1f:98,dst=fa:16:3e:26:2b:d0),eth_type(0x0806), packets:0, bytes:0, used:never, actions:6

# dp flow (xenial-mitaka)
system@ovs-system:
        lookups: hit:409100 missed:25958 lost:0
        flows: 4
        masks: hit:1427427 total:4 hit/pkt:3.28
        port 0: ovs-system (internal)
        port 1: br-int (internal)
        port 2: br-ex (internal)
        port 3: br-data (internal)
        port 4: br-tun (internal)
        port 5: qvo48082a53-ee
        port 6: gre_sys (gre)
        port 7: qvo330b5535-cf

recirc_id(0),tunnel(tun_id=0x5,src=10.5.6.194,dst=10.5.6.197,ttl=64,flags(-df-csum+key)),in_port(6),skb_mark(0),eth(src=fa:16:3e:41:4c:6d,dst=fa:16:3e:cc:aa:4d),eth_type(0x0800),ipv4(frag=no), packets:12, bytes:1359, used:2.637s, actions:5,7

There was at least one mirror rewriting between this two version.
https://github.com/openvswitch/ovs/commit/7efbc3b7c4006caed79cc9afa799cd0f9b8f5d38