If anyone is using rte_latencystats, they are in for a big performance hit. The code in rte_latencystats uses a receive and transmit callback for each burst. The latency calculation is using floating point (slow) and worse yet there is several floating point divides per packet. A floating point divide is one of the slowest opcodes on any processor. The code should be changed to keep track of cycles (fixed point 64 bit) and convert the result to floating point when doing update. Or better yet only use fixed point maths.
Reshma, Can you look at Stephen's recommendations? Thanks