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• #1546 S_x96x_S addikt

  Új Válasz 2019-07-20 04:08:16 #1546

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  S_x96x_S

  addikt

  Az AMD-nak van Infinity Fabric-ja házon belül,
  de ez belső protokoll,
  és emellett támogatni kell más külső szabványokat is.

  AnandTech-es hír:
  AMD Joins CXL Consortium: Playing in All The Interconnects
  " AMD now supports all of the current and upcoming non-proprietary high-speed interconnect protocols, including CCIX, Gen-Z, and OpenCAPI."
  https://www.anandtech.com/show/14660/amd-joins-cxl-consortium-a-coherent-inteldeveloped-pcie-50based-io

  A CXL -es témához.
  Blog: PCIe is Becoming a Battlefield
  19 July 2019Kevin Krewell
  https://www.eetasia.com/news/article/Blog-PCIe-is-Becoming-a-Battlefield

  "Due to its asymmetrical design, CXL does not support near-memory processing fully nor memory expansion with fine grain data sharing at all. This last trait is useful for speeding up database applications with accelerators.

  Another key benefit of CCIX is that it leverages existing PCIe infrastructure while CXL will require dynamic hardware bypass of the PCIe data link layer. These changes will require significant new compliance tests. The companies providing IP for PCIe controllers are only now able to evaluate the changes required to support CXL.

  Intel is pushing the CPU-centric CXL as a standard, but it was developed purely inside Intel. The key feature that Intel and its partners note is that it minimizes memory latency over the PCIe bus. It accomplishes that lower latency by replacing the PCIe data-link layer (DLL) on the CPU side and bypassing the PCIe driver. The PCIe logic must be able to swap the PCIe DLL with the CXL control logic. This approach does save a few nanoseconds, but at the price of flexibility.
  "

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