Hi Anton,
This guide may help you:
https://kb.ettus.com/USRP_Host_Performance_Tuning_Tips_and_Tricks
I usually use the CPU Governor, Thread Priority Scheduling, Adjust
Network Buffers, and Adjust Ethernet MTU sections.
I can run flowgraphs at 30.72MSps without hiccups. Thus, I suggest you
check your host capabilities and probably more important: Check that GR
is compiled and installed with `CMAKE_BUILD_TYPE=Release`.
Besides, you may want to investigate which thread (and thus GR block) is
the culprit. A first simple approach would be to use htop and find out
which thread is close to 100% CPU load. If you change the htop Display
Options to "Show custom thread names" it should be fairly simple to get
a better understanding of your issue.
Cheers
Johannes
On 05.05.22 20:52, Dobler, Anton wrote:
Dear community,
I am running UHD 4.0 and GNURadio 3.10 on a Ubuntu 20.04 with a N310 as
a SDR.
When I execute the benchmark_rate example with DPDK enabled, I do not
see any under- or overruns even with the sampling rate set to 125 MHz,
however using GNURadio - DPDK enabled here as well - I do not achieve
that high sampling rate. The limit seems to be around 30MHz though.
Do you know, apart from using taskset and isolcpus any other possibility
to achieve higher sampling rates?
Would it be an option to use the realtime kernel available for Ubuntu
20.04 and is this kernel compatible with GNURadio?
Any help also with regards to the usage of taskset and isolcpus would be
highly appreciated!
Thank you in advance!
BR,
Anton
