Hello All, So I have been running some tests today using the benchmark_rate test to try and find the solution to the underruns I am getting when executing a GRC flowgraph. I am trying to get the flowgraph to run at a 25 MHz sampling rate using a USRP X310 without any underruns. I found that by changing the spp value using --tx_stream_args with the benchmark_rate tests, I was able to stop the underruns I was seeing when using a 25 MHz sampling rate with the default spp value.
Now my question is, how can I go about changing this value within my GRC flowgraph? Is this a value I can set within the UHD USRP Sink block? How can I determine mathematically what the best spp value would be to maximize the performance of the GRC flowgraph? Any help or insight I can get for this problem would be greatly appreciated. Best Regards, Jerrid
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