Intel

CXL Memory NUMA Node Mapping with Sub-NUMA Clustering (SNC) on Linux

CXL (Compute Express Link) memory devices are revolutionizing server architectures, but they also introduce new NUMA complexity, especially when advanced memory configurations, such as Sub-NUMA Clustering (SNC), are enabled. One of the most confusing issues is the mismatch between NUMA node numbers reported by CXL sysfs attributes and those used by Linux memory management tools.

This blog post walks through a real-world scenario, complete with command outputs and diagrams, to help you understand and resolve the CXL NUMA node mapping issue with SNC enabled.

CXL Server Buyer's Guide: A Complete List of GA Platforms

Last Updated: June 2, 2026

This quick-reference guide provides a definitive, up-to-date list of generally available (GA) Compute Express Link (CXL) servers from major OEMs including Dell, HPE, Lenovo, and Supermicro. It is designed for data center architects, engineers, and IT decision-makers who need to identify and compare server platforms that support CXL 1.1 and CXL 2.0 for memory expansion and pooling.

Compute Express Link (CXL) is an open-standard interconnect that enables high-speed, low-latency communication between processors and attached devices such as accelerators and memory expanders. CXL 2.0 adoption has accelerated significantly since 2025, with all major CPU platforms now supporting it natively and the first hyperscale cloud deployments validated in production.