I will add that if your waveform is repeating (I noticed the --repeat flag), you can alternatively use the Replay block to playout your Tx waveform. With this block you load the samples in the Replay block memory in non-realtime and then you can initiate the playout to the radio and avoid all underruns. But, if your waveform is non-repeating or not known in advance, this won't help. Rob
On Wed, Jul 30, 2025 at 6:09 AM Martin Braun <martin.br...@ettus.com> wrote: > Any answer is a variation of "get a better computer" and "get better > software". tx_samples_from_file is an example that is meant to show how to > use UHD APIs, although 20 Msps is pretty slow and this tool should be > perfectly capable of handling that. You can even safely transmit 20 Msps > over 1 GbE. You could try mounting your reference file on a ramdisk. Also, > run benchmark_rate to make sure your connection is capable of handling the > speed. You can also check out > https://kb.ettus.com/USRP_Host_Performance_Tuning_Tips_and_Tricks, > although those tuning tips are typically meant for higher rates (and for 10 > or 100 GbE). > > --M > > On Wed, Jul 30, 2025 at 8:46 AM <gech...@gmail.com> wrote: > >> Hello, >> >> I’m using USRP X310 devices on both the transmitting and receiving ends >> to handle a data stream. During transmission, I run the following command: >> >> /usr/lib/uhd/examples/tx_samples_from_file --freq 2484e6 --rate 20e6 >> --gain 10 --wirefmt sc16 --ref=internal --file >> /home/ubuntutx/uhd/examples/tx_transmit_data.dat --repeat >> >> I encounter consistent underflow issues (indicated by "U" messages in the >> console), regardless of the sample rate used. Could you please advise how >> to modify my setup or code to enable stable transmission and reception >> without these underflow errors? >> >> Thank you, >> >> Getaneh Berie >> _______________________________________________ >> USRP-users mailing list -- usrp-users@lists.ettus.com >> To unsubscribe send an email to usrp-users-le...@lists.ettus.com >> > _______________________________________________ > USRP-users mailing list -- usrp-users@lists.ettus.com > To unsubscribe send an email to usrp-users-le...@lists.ettus.com >
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