Re: [dpdk-dev] [PATCH v4] build: optional NUMA and cpu counts detection

["Juraj Linkeš" <juraj.linkes@pantheon.tech>]

> >>> [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.

> >
> >> $ 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.