CPU Affinity Not Working in RHEL8 with DPDK 20.05

[Rashi Agarwal]

Hi DPDK Community,

I am facing an issue where CPU affinity is not working as expected in RHEL8 with DPDK 20.05, while it works fine in RHEL7.
Problem Statement:
      *  When running my program with numactl -C4,5 ./testRTE on RHEL7, the worker threads correctly bind to the assigned cores.
      *  However, on RHEL8, the worker threads always bind to core 1, ignoring the specified CPU set.

Environment Details:

  *   DPDK Version: 20.05.0
  *   OS: RHEL8 (Issue) | RHEL7 (Works Fine)
  *   CPU Affinity Tool: numactl -C
Sample Program:  Attached
Observations:

  *   In RHEL7, worker threads correctly bind to cores specified using numactl -C.
  *   In RHEL8, the threads always bind to core 1, ignoring the CPU set.
  *   Could DPDK be overriding the CPU affinity in RHEL8?
Questions:

  1.  Is there any known change in CPU affinity handling between RHEL7 and RHEL8 affecting DPDK?
  2.  Does DPDK override thread affinity when rte_eal_init() is called?
  3.  Is there any workaround or EAL flag to ensure that CPU affinity is respected?
Any insights or suggestions would be greatly appreciated.
Thanks,
Rashi Agarwal.
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