Benchmark_rate issue

GNU Radio
1

I am doing spectrum sensing at 8MHz sampling rate using N210 series.

I have 4 USRPs accessible via switch.
But on setting sample rate as high as 8 MHz the code runs for few
seconds
and comes out with UHD Error.

I did benchmark test as follows:-

./benchmark_rate --args=“addr=10.32.19.159” --rx_rate 3e6 --tx_rate
3e6

Report:-
“UUUUUUUUOUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUOUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUU”
Benchmark rate summary:
Num received samples: 27897639

  • Num dropped samples: 2395800*
  • Num overflows detected: 660*
  • Num transmitted samples: 29685777*
  • Num sequence errors: 0*
  • Num underflows detected: 74568*
    note:-There were many "UUU"s than pasted.

./benchmark_rate --args=“addr=10.32.19.159” --rx_rate 5e6 --tx_rate
5e6
*
*
Report:-
Using Device: Single USRP:
Device: USRP2 / N-Series Device
Mboard 0: N210r4
RX Channel: 0
RX DSP: 0
RX Dboard: A
RX Subdev: SBXv3 RX
TX Channel: 0
TX DSP: 0
TX Dboard: A
TX Subdev: SBXv3 TX

UHD Warning:
Unable to set the thread priority. Performance may be negatively
affected.
Please see the general application notes in the manual for
instructions.
EnvironmentError: OSError: error in pthread_setschedparam

UHD Warning:
Unable to set the thread priority. Performance may be negatively
affected.
Please see the general application notes in the manual for
instructions.
EnvironmentError: OSError: error in pthread_setschedparam

Testing receive rate 5.000000 Msps
OTesting transmit rate 5.000000 Msps

OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO
t erminate called after throwing an instance of ‘uhd::runtime_error’
what(): RuntimeError: fifo ctrl timed out looking for acks
Aborted

How can I achieve higher sample rate on my system?
Is it mainly due to switch in between?

2

How can I achieve higher sample rate on my system?
Is it mainly due to switch in between?

From your previous email, it sounded like you may have something
“interesting” with your network configuration, or network topology.

I recommend first trying with a direct connection to a gigE port on the
PC. See if the applications work as expected. See if the strange errors
go away.

-josh

PS. Also this is a real PC, not a virtual machine? Often VMs mean more
networking troubles and slowness.

-josh