I  have collected a  summary  of my findings so far  on docker overlay 
network  performance .  The table follows.   As is obvious there is 
significant performance penalty form Linux vxlan and bridge. 


End points 

Mtu

NIC vxlan acceleration

Rate (Gbps)

Notes

Host to host

9000

N/A

9.63

Host-vxlan to host-vxlan

8950

no

7.01

Linux vxlan overhead (?) 

Docker overlay 

8950

no

3.96

Linux bridge overhead (?)

Docker overlay 

1450

no

1.11

Small mtu penalty



Improving  performance  in both Linux vxlan and bridge, in addition to 
offload to NIC should also improve results. 


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