Why am I unable to enable TSO on virtual network interfaces on RHEL 6.5?

Solution Verified - Updated -

Issue

When booting RHEL 6.5 kernel 2.6.32-431.el6.x86_64, this message appears in the console/dmesg:

lo: Dropping TSO features since no CSUM feature.
(null): Dropping TSO features since no CSUM feature.
(null): Dropping TSO6 features since no CSUM feature.
rhevm: Dropping TSO features since no CSUM feature.

Environment

  • Red Hat Enterprise Linux (RHEL) 6.5.
  • Any virtual network interface.

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