Hi, In many articles about ovs, there are some mention that hashing function cause quite significant overhead. Also, I did 'perf record' performing OVS L3 forwarding, and found that.
So, an idea comes up, which is that implement RSS hash algorithm(Toeplitz hash algorithm) in kernel datapath module. However, I stucked in processing mask the 'struct sw_flow_key'. I insert only one rule 'ovs-ofctl add-flow ovs-br1 nw_dst=100.1.1.1,actions=mod_dl_dst:90:e2:ba:5b:88:2c,in_port'. Strangely, mac_src, mac_dst, ip_src, ip_dst, and port value in struct sw_flow_key is changed after calling ovs_flow_mask_key() in masked_flow_lookup(). I can not understand why mask processing turn on and why mask processing change almost all values in sw_flow_key. Please let me know if you have any insights.
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