[USRP-users] Underflows with simple rx/tx GNU Radio flowgraph on USRP X310 under RFNOC UHD

Piotr Krysik perper at o2.pl
Sun Oct 22 06:04:04 EDT 2017

Hi all,

I'm prepared a basic GNU Radio flow-graph that does simultaneous
transmission and reception (see the attachment). For USRP X310 and RFNOC
UHD (version above 3.10.x) soon after starting the flow-graph there is a
lot of buffer underflows (even for low sample rate like 1MS/s). For
pre-RFNOC UHD (3.9.6) everything works fine.

What is a bit strange is that txrx_loopback_to_file UHD example works
fine for all versions of UHD.

Is anybody here able to run GNU Radio flow-graphs with simultaneous tx
and rx on X310 with RFNOC UHD and without underflows?

Best Regards,
Piotr Krysik

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