Compute Express Link is the memory tier 3D XPoint died chasing — rebuilt from commodity DRAM over a cache-coherent link on the PCIe physical layer. How CXL.io/.cache/.mem work, the Type 1/2/3 device taxonomy, the 1.1-to-3.0 progression from expansion to pooling to true sharing, the real latency tax, and how Linux actually tiers it.
Data-Center
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CXL: Memory Pooling and the Disaggregated Server