Intel Sub-NUMA Clustering Will Stop Clashing With Resource Director On Linux 6.11+
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SNC allows partitioning the CPU cores / L3 cache / memory into multiple NUMA domains and can help enhance performance for NUMA-optimized workloads. Intel RDT meanwhile provides for monitoring and greater controls over resources around the last level cache handling and memory bandwidth use. These two features would collide and thus Intel has recommended both aren't engaged concurrently. After many rounds of patch review, SNC + RDT together should behave with code now submitted for the Linux 6.11 kernel.
The x86/cache pull request was submitted from tip/tip.git to the mainline kernel today. As explained in that pull request:
"Enable Sub-NUMA clustering to work with resource control on Intel by teaching resctrl to handle scopes due to the clustering which partitions the L3 cache into sets. Modify and extend the subsystem to handle such scopes properly"
So now those using Intel servers can enjoy both Sub-NUMA Clustering and Resource Director Technology for optimizing performance without the features clashing.
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