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This conference talk explores the evolution of Compute eXpress Link (CXL) technology, covering its maturation in specifications and software support. Learn about the current ecosystem focus on memory expansion and pooling solutions, as well as emerging CXL-attached accelerator drivers. The presentation begins with a brief overview of CXL fundamentals before delving into ecosystem challenges, with particular attention to arm64 platform implementation issues compared to x86 systems. Discover the technical hurdles in enabling necessary cache flushes for remapping host-to-device physical address spaces on arm64 platforms, examining both native driver approaches and firmware-mediated solutions. The talk also addresses optimal data placement challenges in heterogeneous memory environments, comparing arm-specific optimizations with cross-platform infrastructure solutions. Gain valuable insights into this crucial data center technology's trajectory and the key problems that must be solved for its continued advancement.
