There appears to be a kernel problem that prevents AF_Packet fanout mode. This appears to be causing a ton of ack/syn errors and problems.
The current Rocknsm seems to be at this kernel level which appears to have the bug.
BOOT_IMAGE=/vmlinuz-3.10.0-1062.1.2.el7.x86_64 root=UUID=76513ac8-96d4-4193-8c17-34bf6eee38a1 ro rhgb quiet LANG=en_US.UTF-8
I checked this on a current sensor with https://github.com/JustinAzoff/can-i-use-afpacket-fanout tool. It reports that issues with flows coming back on the wrong treads.
Any way we can get fixed kernel or a work around?