Hi, I noticed that there is a performance issue when running traffic on a vlan interface that was created by OVS. If we create a bridge with a vlan interface, the 8021q module is not loaded. Then when packets with a 8021q tag arrives, the linux stack can't use the vlan ndos (such as gro_recieve) since there is no such vlan device. If I perform the same test after loading the 8021q module, I get 2x-5x better performance. I personally test that using tunnels (vxlan) but I think the issue exists even without the tunnel.
*Creating a bridge and vlan interface:* ovs-vsctl --no-wait add-br br_0 ip link set br_0 up ovs-vsctl --no-wait add-port br_0 ens5f0 ovs-vsctl --no-wait add-port br_0 vlan10 tag=10 -- set interface vlan10 type=internal ip link set vlan10 up ip addr add <ip> dev vlan10 run traffic (netperf on the vlan10 interface) and see the result. Then do 'modprobe 8021q' and perform the same test -> you will see much better numbers. I am suggesting to load 80021q module once vlan interface is added through ovs. similarly as a vlan interface would be created using 'ip link'. Michael
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