Ostinato customer Leslie recently reported that the
per-stream stats feature was not working for him in certain cases and the Rx stats was always 0.
Upon investigation, I found that this
problem is specific to Linux and only when using vlan tagged packets with the per-stream stats feature.
The culprit turns out to be libpcap - the packet capture library.
Read the blog post for details and the solution/workaround.
Blog Post: Zero RX stream statsSrivats (Creator, Ostinato)