Commits on Jun 10, 2022

1. Optimize NodePort performance by reducing request packets CT actions …

   For a NodePort connection sourced from external network or local Node,
   destination IP will be DNATed with a virtual IP, then the connection
   will be forwarded to OVS via Antrea gateway. However, in UnSNATTable,
   a flow is installed to unSNAT replied packets of SNATed connections by
   matching the virtual IP as destination IP. The flow is like the following:
   
   ```
   table=UnSNAT, priority=200,ip,nw_dst=169.254.0.253 actions=ct(table=ConntrackZone,zone=65521,nat)
   ```
   
   Note that, the request packets of a DNATed NodePort connection are also
   matched by the flow above, but it is unnecessary. To optimize the
   performance of NodePort, another virtual IP is used to DNAT NodePort
   connections.
   
   TCP_RR and TCP_CRR improvement is as fowllows:
   
   ```
   Test      old TPS     new TPS    delta
   TCP_CRR   3510.28     3847.76    +%9.61
   TCP_RR    9574.29     10457.6    +%9.23
   ```
   
   Signed-off-by: Hongliang Liu <lhongliang@vmware.com>

   

   hongliangl committed Jun 10, 2022
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