[Discuss-gnuradio] Overflow error in benchmark receiver side "DDDD"

Hii,

I am running benchmark code and on the receiver side after receiving some number of packets(8000 so), it starts showing overflow errors ("DDDD") on terminal.
Following is the system configuration

python benchmark_rx.py -f 1100M --args "addr=10.32.38.163" --to-file=/home/ashokbandi/GNU/a_rx.txt --bandwidth=500000

Decreasing the bandwidth delays the error.

I tried changing buffer size by setting net.core.rmem_max and net.core.wmem_max to 33445532 but to no avail.

Following is the screen shot of terminal

DDok: True      pktno: 24116      n_rcvd: 9730      n_right: 9723
DDDDDDDDok: True      pktno: 24182      n_rcvd: 9731      n_right: 9724
DDDDDDDDDDDDDDok: True      pktno: 24319      n_rcvd: 9732      n_right: 9725
DDDDDDDDDDDDDDDDok: True      pktno: 24442      n_rcvd: 9733      n_right: 9726
DDDok: True      pktno: 24477      n_rcvd: 9734      n_right: 9727
DDDDDDDDDok: True      pktno: 24568      n_rcvd: 9735      n_right: 9728
DDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDok: False      pktno: 22729      n_rcvd: 9736      n_right: 9728

Thanks