TCP retransmissions poor throughput and rx_no_buffer errors increasing on ibmveth NIC

Solution In Progress - Updated -


  • When TCP connections and TCP traffic load increases at a certain point the network is flooded with retransmissions due to packet drop which results in very poor network performance.


  • PPC64 LPAR
    • ibmveth NIC
    • Database application
    • multiple CPU cores allocated to LPAR
    • 1000s of TCP connection.

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