Re: [PATCH v5 0/8] Add support for Sub-NUMA cluster (SNC) systems

[Reinette Chatre]

Hi Tony,

On 8/29/2023 4:44 PM, Tony Luck 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.

Same typo as in V4.

> 
> Note that this patch series improves resctrl reporting considerably
> on systems with SNC enabled, but there will still be some anomalies
> for processes accessing memory from other sub-NUMA nodes.

I have the same question as with V4 that was not answered in that email
thread nor in this new version.
https://lore.kernel.org/lkml/e350514e-76ed-14ea-3e74-c0852658182f@xxxxxxxxx/

I stop my review of this series here.

Reinette