Why the interface speed in 'ethtool' output is not displayed for the virtual machines running on Hyper-V ?

Solution Verified - Updated -

Issue

  • Interface speed is not displayed in the ethtool command output for the virtual machines running on Hyper-V
  • Output like below is seen with less details as compared to that seen for a interface of a physical system:
# ethtool eth0 
Settings for eth0:
    Link detected: yes

Environment

  • Red Hat Enterprise Linux 6 (as virtual guest)
  • Microsoft Hyper-V hypervisor
  • Paravirtualized hv_netvsc network interface

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