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

Piotr Krysik perper at o2.pl
Tue Oct 24 08:51:23 EDT 2017

W dniu 22.10.2017 o 12:04, Piotr Krysik via USRP-users pisze:
> 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?
Little update:
I've got the issue only on 10 gigabit ethernet interface. For the 1
gigabit one it works well.
So it might be fault of my particular setup.

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