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
