On 05/04/2019 12:15 AM, Rensi Mathew via USRP-users wrote:
Dear sir
I am using B200 SDR to run the program usrp_spectrum_sense.py with a
sampling frequency of 16e6.
I think I am using a fairly low sampling rate.
Still I am getting some 'OOOO'.
Could someone tell me the possible reasons for the same? And how I can
avoid the same?
Overruns mean that your computer isn't keeping up with the sample flow
from the radio. Sometimes, you can increase the buffering
in the USB driver to reduce the occurrence of this:
https://files.ettus.com/manual/page_transport.html#transport_usb_params
In particular, "num_recv_frames" can help--I'd suggest 128 or 256.
What type of computer are you using? Are you setting your CPU governor
to "performance" mode?
Whether any given sample-rate is "fairly low" depends VERY much on what
your computer is *doing* with those samples--the more complex
the operations that are happening at the input sample rate, the
harder your computer is working.
Thanking you
Rensi Sam
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