On 04/11/2024 20:12, dhpanch...@gmail.com wrote:
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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Just to fill people in, this appears in the DPDK document:
https://kb.ettus.com/Getting_Started_with_DPDK_and_UHD
But NOT in the general "Performance Tuning Tips and Tricks", which is
the one I'm most familiar with:
https://kb.ettus.com/USRP_Host_Performance_Tuning_Tips_and_Tricks
We will probably move that note on RT_RUNTIME_SHARE to the "Performance
Tuning" document, or at least
replicate it.
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