Elastic Fabric Adapter (EFA): EFA is a network device that you can attach to your Amazon EC2 instance to accelarate High performance computing (HPC) and machine learning applications.
EFA provides lower and more consistent latence and higher throughput than the TPC transport traditionally used in cloud-based HPC system.
EFA can use OS-bypass. OS-bypass enables HPC and machine learning applications to by pass the lot lower latency. Not supported with Windows currently, only Linux.