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[However, we also would need to find out how BSD numbers the
domains, too, as it's possible an OS could just call them 0 and 1,
rather than
0 and 8 if it wanted to.]

In short, we'd need to test to be sure. Is FreeBSD on P9 a supported
config, and if so can the P9 maintainer perhaps help out with testing?

Results of the v4 patch on an IBM AC922 P9 system with Linux:

Can you get results from FreeBSD as well?

I can't help with FreeBSD here, I only have Linux on systems within IBM.

This is an open question still then. I guess we'll have to go with sysctl -n vm.ndomains.

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$ python3 get-numa-count.py
8
NUMA node0 CPU(s):   0-63
NUMA node8 CPU(s):   64-127

<snip>
Is this the right number for your case, i.e. are you able to use both numa nodes

when RTE_MAX_NUMA_NODES=8?

node8 above is the ninth NUMA node so I'd need to use
RTE_MAX_NUMA_NODES=9 as a minimum so that any arrays using that value
are adequately sized.

Dave

Ok, the proper value to return is highest numa node + 1 then.