Re: [Discuss-gnuradio] Getting overflows at 50 Msps (not sure why)

[Ron Economos]

On 6/4/2014 2:16 PM, Orin Lincoln wrote:
> Hello,
>
> I am trying to get samples from a B200 at 50 Msps into GNU Radio. The 
> UHD benchmark_rate tool receives at 50 Msps without any overflows 
> detected. My GNU Radio flowgraph is simply a USRP source connected to 
> a null sink, and I'm still getting overflows. I've tried expanding the 
> min_output_buffer for the USRP source, but that doesn't seem to help. 
> I really don't know what is causing the problem. Any suggestions about 
> what I should try?
>
> Thank you,
> Orin Lincoln
On bladeRF, the number of USB3.0 buffers makes a big difference
in the maximum sample rate without overruns. On the B200, you
can try the same thing by increasing the number of buffers
in the device_addr arguments.

device_addr="recv_frame_size=65536,num_recv_frames=128,...."

Ron