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MZ620 NIC V100R001 User Guide 05

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Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
Feature Description

Feature Description


The MZ620 supports the RDMA feature. This feature uses the kernel bypass technology to reduce the packet processing and forwarding latency of the HCA, to reduce the CPU usage, and to implement low-latency data transmission over the data center network. With the RDMA feature, the end-to-end read and write delay of the HCA can reach 1 us when the packet length is 128 bytes. The MZ620 supports 16 million I/O channels (equivalent to IB QPs), and provides priority-based scheduling and flow control to support low-latency, high-bandwidth network transmission. The MZ620 supports OpenFabrics Enterprise Distribution for Linux (Linux OFED).


The MZ620 supports end-to-end QoS for IB. It supports the VL mechanism defined in IB specifications, VL arbitration, and control-domain and service-domain prioritizing. The end-to-end QoS priority is represented by the service level (SL) domain of IB packets. Each SL is mapped to a VL. SMs configure VL arbitration and the SL-to-VL mapping table using network management datagrams (MADs). The MZ620 supports nine VLs, including eight data VLs and one control VL.

Updated: 2019-09-02

Document ID: EDOC1000172487

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