[B.A.T.M.A.N.] batman-adv bonding feature - unable to get data packets fragmented into multiple wireless interfaces

hi

I tested the throughput between point to point mesh nodes using single and 2 radios.

1. Using single radio (ch 5180) the resulting throughput for HT40+ TCP max 250mbit/s UDP - max 320mbit/s

2. Using 2 radios with and without batctl bonding enabled (ch 5180 for wlan0, ch 5785 for wlan1), the resulting throughput for HT40+ is same. with batctl bonding and fragmentation enabled I believed I should be getting 50% gain in througput. When I monitor the wlan0 and wlan1 interfaces using batctl tcpdump -p 4 wlanx I can see that iperf data are interleaved. There is no splitting of data frames into 2 wireless interfaces.

Please advice

Tq

Syed