USRP X410 Underflows and Overflows

From:

Mammadova, Olivia

Subject:

Date:

Wed, 14 Feb 2024 11:48:03 +0000

Hello together,

i wrote a code for a linear chirp and added the code to the python generated by grc, because GNU Radio has no building block for a linear chirp except using Signal source and VCO Block.

I tried to simulate the linear chirp signal on USRP X410 and send the chirp signa to USRP X410 l and check the output with the spectrum analyzer. Unfortunately, the simulation causes underflows and overflows for the sample rate starting at 1 MHz and i cannot receive a proper linear chirp at UHD Source. Moreover, the CPU Usage during the python simulation is below 10%.. When i stop the simulation and want to restart the simulation, RFoncError occurs: Attempting to reconnect input port.

I tried to resize the buffer using sudo nano /etc/sysctl.d/99-custom.conf and added net.core.rmem_max=250000000 and applied the changes using sudo sysctl -p /etc/sysctl.d/99-custom.conf. The the buffer size is resized, but the overflows and underflows are yet occuring and the cpu usage is below 10%.

I am sending you the screenshots of my simulation console and hope that you help me!

Thank you in advance!

Best regards,

Olivia Mammadova

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Re: USRP X410 Underflows and Overflows, Marcus Müller, 2024/02/14