I got it work. It seems RT_RUNTIME_SHARE disabled was the culprit. I re-enabled it using these instructions and the benchmark worked without packet drops or underruns:\ \ **Underruns Every Second with DPDK + Ubuntu**
With Linux kernels 5.10 and beyond, we have observed periodic underruns on systems that otherwise have no issues. These Linux kernel versions are the default for Ubuntu 20.04.3 LTS and later. The underrun issue is due to the `RT_RUNTIME_SHARE` feature being disabled by default in these versions of the Linux kernel (shown as `NO_RT_RUNTIME_SHARE`). The following procedure can be used to enable this feature. This process was tested on Linux kernel version 5.13; the procedure may be slightly different on other kernel versions. To determine the Linux kernel version of your system, in a terminal issue the command `uname -r`. ``` $ sudo -s $ cd /sys/kernel/debug/sched $ cat features | tr ' ' '\n' | grep RUNTIME_SHARE NO_RT_RUNTIME_SHARE $ echo RT_RUNTIME_SHARE > features $ cat features | tr ' ' '\n' | grep RUNTIME_SHARE RT_RUNTIME_SHARE ```
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