Unable to reach 1.4M PPS on CCR

’m doing the load test on the CCR1036, we found that the latest version 6.37.1 cannot obtain the > 1million PPS on the 1G link, while the older version 6.7 can. Can you look into it accordingly?

Here is the test case

CCR1 Traffic Generator ether2 => CCR2 ether2 => CCR1 ether3
CCR1 Traffic Generator ether3 => CCR3 ether3 => CCR1 ether2

Traffic Template => MAC, IP, UDP, PPS 1400000, Packet Size 64

same configuration tested on 6.37.1, 6.30.4. both version @ CCR2 reach CPU 100%, 91% on the networking service in less than 30 seconds. and stop forwarding packet. while on the version 6.7, it is able to forward the packet and CPU is stable.

Specified traffic rate is only achievable using external traffic generators and consumers.