Why when checking the 'speed' for a particular NIC via /sys/device/ filesystem shows "Invalid argument" ?

Solution Verified - Updated -

Issue

  • While checking the speed characteristics for a NIC via /sys/devices/pci* it gives below error;
~]# cat /sys/devices/pci0000:20/0000:20:02.0/0000:27:00.0/net/ens6/speed
cat: /sys/devices/pci0000:20/0000:20:02.0/0000:27:00.0/net/ens6/speed: Invalid argument

~]# cat /sys/devices/pci0000:20/0000:20:02.0/0000:27:00.0/net/ens6d1/speed
cat: /sys/devices/pci0000:20/0000:20:02.0/0000:27:00.0/net/ens6d1/speed: Invalid argument

Environment

  • Red Hat Enterprise Linux (All Versions)

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