Why Increasing MTU above 2044 results in an "invalid argument" error on a infiniband device in RHEL ?

Solution Verified - Updated -

Issue

  • Why Increasing MTU above 2044 results in an invalid argument error on a infiniband device in RHEL ?

  • Increasing MTU size on infiniband interface results in below error.

[root@tstsvr]# ip link set dev ib0 mtu 65520
SIOCSIFMTU: Invalid argument
[root@tstsvr]#

Environment

  • Red Hat Enterprise Linux 5
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 7
  • Infiniband

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