AMD NPS bios change is is not reflected onto NUMA domains detected by DPDK 21.11

[Tummala, Sivaprasad]

[AMD Official Use Only]

Hi Antonio,

You need to change the BIOS parameter "L3 Cache as NUMA Domain" to "Disable".
With this, each L3 cache will not be reported as a NUMA domain (/NUMA node).

Thank you!

From: Antonio Di Bacco <a.dibacco.ks at gmail.com<mailto:a.dibacco.ks at gmail.com>>
Sent: Friday, April 22, 2022 10:22 AM
To: users at dpdk.org<mailto:users at dpdk.org>
Subject: AMD NPS bios change is is not reflected onto NUMA domains detected by DPDK 21.11

Using an  AMD EPYC 7713 64-Core Processor (there are two on the server) for a total of 128 cores.

If I change the NPS (numa per socket) in BIOS and power cycle the system and the I launch a DPDK application, I always get this message:

EAL: Detected CPU lcores: 128
EAL: Detected NUMA nodes: 16

NPS is able to change the number of NUMA but DPDK always detects 16 NUMA domains.
I tried with NPS1, NPS2, NPS4.



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