[USRP-users] UHD Freezing after Underruns/Late Samples and Freezing

Richard Mcallister rjm96 at bu.edu
Fri Oct 20 19:25:25 EDT 2017

Hi all,

I'm currently using 4 X310's with LFTXs to transmit. The flowgraph hasn't
changed from last semester when I made it, but its attached. When I run it
with more than one USRP, it will eventually crash and freeze. UHD will
output a single U (underrun) and then continuously print L (late sample?).
With 4 USRPs, this will happen almost immediately.

 I've tried running it on a different computer after system monitor showed
that (roughly) for each USRP being used, one of the 16 cores would go to
around 100% while the others stayed low. I also tried changing the Ethernet
cable, with no success. No success. I've also tried using ethtool to add
more TX/RX descriptors, and I've raised the sysctl rmem/wmem buffers as UHD
indicates. Does anyone else have any good suggestions on what to try?


Rich McAllister
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