0 Replies Latest reply on Oct 21, 2013 3:10 AM by jasonblog

    intel 82599 loss packets


      The intel 82599 NIC connected server(windows server 2008)  via FCoE.When I runned read IO,it is work properly .But When I write IO with block size 1M,it will loss packets.

      ethtool -S eth5 statistic shows:


          rx_missed_errors: 0

           tx_flow_control_xon: 0

           rx_flow_control_xon: 26004

           tx_flow_control_xoff: 0

           rx_flow_control_xoff: 26004

      The flow control works properly and no packets dropped.


           rx_missed_errors: 62295

           tx_flow_control_xon: 272

           rx_flow_control_xon: 0

           tx_flow_control_xoff: 344

           rx_flow_control_xoff: 0

      The flow control seems does not work properly and many packets droppeed. Is the link partner  not honoring the flow control packets!

      windows server 2008 FCoE configuration box:

      DCBx Version:IEEE 802.1Qaz

      Priority Group:Feature not present in peer TLV

      Priority Flow Control:Operational

      FCoE Status:Feature not present in peer TLV


      Why is there differerent between read and wirte in the same environment?

      What is the meanning of "tx_flow_control_xon"?

      Appreciate your answer