Cannot increase VMware vmxnet3 ring buffer over 4032 but max is 4096

Solution Verified - Updated -

Issue

  • Cannot increase VMware vmxnet3 ring buffer over 4032 but max is 4096
  • ethtool -G eth1 rx 4096 then ethtool -g eth1 shows:
Ring parameters for eth1:
Pre-set maximums:
RX:     4096
RX Mini:    0
RX Jumbo:   2048
TX:     4096
Current hardware settings:
RX:     4032
RX Mini:    0
RX Jumbo:   128
TX:     512

Environment

  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 7
  • VMware virtual machine
  • vmxnet3 network driver
  • Jumbo Frames aka large MTU like 9000 bytes

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