mlx rdma網卡指標參數簡介

• • 綜述
  • hw_counter
  • counter
  • 參考鏈接

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綜述

mlx5 driver在linux sysfs下有一系列的mlx網卡參數和計數器分布在/sys/class/infiniband/mlx5_x/ports/1/counters和/sys/class/infiniband/mlx5_x/ports/1/hw_counters目錄下，這些參數統計了某種類型的事件發生的次數，如某種錯誤數，收包數等等。理解這些參數，可以幫助我們更好的理解mlx網卡的運行狀態，通過監控，可以更快的定位rdma報錯的根因

hw_counter

• rnr_nak_retry_err：本機作為發送方，收到對端發來的RNR NAK包的數量。如果接收方qp的srq沒有空閑了，這個計數會漲
• out_of_buffer：本機作為接收方，收包的時候發現沒有buffer了，如果自己qp的srq滿了，這個計數會漲
• out_of_sequence：收包亂序
• local_ack_timeout_err：發送的rdma請求超時計數
• packet_seq_err：本機收到NAK包計數
• req_cqe_error：本機CQE報錯計數
• duplicate_request：本機收到重復包
• np_ecn_marked_roce_packets：本機收到的ecn

counter

• port_rcv_data: Total number of data octets, divided by 4 (lanes), received on all VLs. This is 64 bit counter.
• port_rcv_packets: Total number of packets (this may include packets containing Errors. This is 64 bit counter.
• port_xmit_data: Total number of data octets, divided by 4 (lanes), transmitted on all VLs. This is 64 bit counter.
• port_xmit_packets: Total number of packets transmitted on all VLs from this port. This may include packets with errors.
• unicast_rcv_packets: Total number of unicast packets, including unicast packets containing errors.
• unicast_xmit_packets: Total number of unicast packets transmitted on all VLs from the port. This may include unicast packets with errors.

參考鏈接

Understanding mlx5 Linux Counters and Status Parameters

Understanding mlx5 ethtool Counters

Nak Errors

總結

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