Summary of EN141 Webinar: RoCE Introduction

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00:00:00 - 00:15:00

The Broadcom RoCE congestion control solution is designed to alleviate congestion in networks. The video covers the use of Broadcom next, which is a high-performance computing platform that can be used for applications that utilize the message passing interface (MPI) and ucx libraries.

  • 00:00:00 In this video, the presenter introduces the concepts of remote direct memory access (RDMA) and Rocky solution, and covers the benefits of RDMA over traditional methods such as the TCP/IP stack. They then introduce some basic RDMA concepts and describe how an RDMA transfer takes place. Finally, the presenter covers different RDMA setups and how to signal an RDMA transfer to start.
  • 00:05:00 The RoCE protocol layers at the top include the RDMA stack. Applications that make use of the RDMA stack are well suited for applications that move massive amounts of data across CPUs on different hosts. The RDMA stack provides reliable delivery of data across applications, including packet-free transmission for lost packets. The network layer provides Network Services, such as packet creation and addressing, and routing. Below the network layer are the RDMA link and physical layers. These layers handle packet-level transmission and reception, provide link level addressing, flow control, and error detection. The RoCE protocol layers are independent of the underlying Network Fabric. Applications using the RDMA interface verbs can even be used for Iowa, which is RDMA over TCP.
  • 00:10:00 Broadcom's Rocky control path and data path are implemented via the next firmware and the neck Hardware, as well as Linux's broadcom Rocky. The software and hardware components fit into the Linux RDMA stack, and the Rocky user space library and the Rocky kernel space driver communicate with the Nic firmware and the neck Hardware over pcie for both control path and data path operations. The rocky data path is completely implemented in the Nik Hardware, and high performance Computing HPC uses RDMA extensively where data is exchanged via RDMA across multiple hosts and multiple codes in a cluster. Many HPC applications make use of the message passing interface MPI which is a specification for parallel Computing architectures allowing data exchange between various nodes in a cluster. There are many implementations of NPI such as openmpi MPI chameleon am WAP H2 and Intel MPI Etc MPI implementations can make use of unified Communications X framework referred to as ucx which is a library for optimizing and achieving low level software overheads in our communication path. Broadcom's deck and Rocky software stack can be used for HPC applications that utilize MPI and ucx libraries on Ethernet based clusters. Broadcom next support the prmm direct feature prmm direct allows RDMA across peer
  • 00:15:00 This video provides an overview of the Broadcom RoCE congestion control solution, which is designed to alleviate congestion in networks. The video also covers the use of Broadcom next, which is a high-performance computing platform.

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