Re: [PATCH v6 0/8] Add support for Sub-NUMA cluster (SNC) systems

[Peter Newman]

Hi Tony,

On Thu, Sep 28, 2023 at 9:14 PM Tony Luck <tony.luck@xxxxxxxxx> wrote:
>
> The Sub-NUMA cluster feature on some Intel processors partitions
> the CPUs that share an L3 cache into two or more sets. This plays
> havoc with the Resource Director Technology (RDT) monitoring features.
> Prior to this patch Intel has advised that SNC and RDT are incompatible.
>
> Some of these CPU support an MSR that can partition the RMID
> counters in the same way. This allows for monitoring features
> to be used (with the caveat that memory accesses between different
> SNC NUMA nodes may still not be counted accuratlely.

Is an "SNC NUMA node" a "sub-NUMA node", or a NUMA node on which SNC
has been enabled?

Thanks!
-Peter