CPU Performance

CPU performance can be checked in the eNB screen using the command

t cpu

the output will look like this

-Proc- ---RX-------- ---TX-------- ---- TX/RX diff (ms) CPU MS/s CPU MS/s CPU min/avg/max sigma 22.0% 5.760 4.6% 5.758 1.3% 2.53/3.1/3.6 ±0.3 22.0% 5.760 4.6% 5.760 1.3% 2.52/3.1/3.6 ±0.3 22.0% 5.760 4.6% 5.760 1.3% 2.51/3.1/3.6 ±0.3 22.0% 5.760 4.6% 5.760 1.4% 2.53/3.1/3.6 ±0.3 22.0% 5.760 4.6% 5.760 1.4% 2.53/3.1/3.6 ±0.3

The interesting part is the "TX/RX diff" and particularly the "min" value, this corresponds tothe minimum available time for radio front end processing. This value must always remain positive.

For more details please read the appnote_cpu.pdf located under "doc" folder of enb software package.

If you are facing "TX/RX diff min" value below zero, you can:

Ensure that you are running the lte_init.sh script (it should be done automatically if you use the LTE service)
CPU frequency scaling is disabled on your system (the "lscpu" Linux command should report a 'CPU MHz' close to 'CPU max MHz' and stable over time). Frequency scaling can be disabled from the BIOS.
All graphical interfaces are disabled