[Discuss-gnuradio] Overrun issue and packet loss

[Sam mite]

I am facing Overrun issue on 500K sampling rate with USRPN210. I see an 'O' after irregular time intervals when I use my flowgrpah . PC is directly connected to USRP with Ethernet cable. PC details:

Processor: Intel® Core™ i7-2600 CPU @ 3.40GHz × 8
Memory: 3.8GiB

GNU C++ version 4.6.3; Boost_104601; UHD_003.005.000-26-gb65a3924
Gnruadio version: 3.6.3rc0

Also to check, I ran ./benchmark_rate --rx_rate 500e3 --duration 300, three times and following are the outputs:

Testing receive rate 0.500000 Msps
OO
Benchmark rate summary:
  Num received samples:    149997045
  Num dropped samples:     726
  Num overflows detected:  2

Testing receive rate 0.500000 Msps

Benchmark rate summary:
  Num received samples:    149998497
  Num dropped samples:     0
  Num overflows detected:  0

Testing receive rate 0.500000 Msps
OOO
Benchmark rate summary:
  Num received samples:    149997408
  Num dropped samples:     1089
  Num overflows detected:  3


What could be the issue here? And what can I do to fix this issue as I am losing 3 to 4 packets in every 10k packets when I use my flow-graph. Any comments would be appreciated.

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Best Regards,

Sam