CXL Solution Deployment in Hyperscale Datacenters

This technical report presents the deployment of a Compute Express Link (CXL) solution at scale within hyperscale datacenters, addressing significant memory capacity constraints. The report outlines the challenges faced in memory expansion, particularly the limitations of existing memory architectures, which often lead to performance bottlenecks. It details the design of an in-house CXL ASIC optimized for memory reuse and low latency, as well as the software configuration necessary for efficient workload management. The findings demonstrate substantial performance improvements, including a reduction in server count by up to 25% for specific workloads and a notable decrease in average latency for distributed caching systems. The report also clarifies misconceptions regarding CXL, such as concerns about latency and overhead, providing evidence that with proper engineering, CXL can deliver performance comparable to local DRAM. Overall, the document serves as a comprehensive account of the real-world applicability and benefits of CXL technology in modern datacenter operations.