How do I check the network speed of a virtio-net network interface?

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Issue

How do I check the network speed of a virtio-net network interface?
When a VM use virtio NICs, ethtool is not working
Why virtio network nic speed is 1G in subnetwork tab in RHEV Manager web interface ?

Environment

Red Hat Enterprise Linux virtualisation host (KVM or RHEV)
Linux guest using virtio-net network interface

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