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0e1f616
(Get the code!)
For LPAR -> it's a valid test to verity max speed and actual speeds
For z/VM -> the cards are virtualised on the host, thus any test of max & actual speeds is bogus
For z/KVM -> the cards are virtualised on the host, thus any test of max & actual speeds is bogus
Comparing z/VM and z/KVM with other architectures is also bogus, as completely different kernel drivers are used to implement the cards (qeth driver on a CCW bus and CCW-virtio bus, CCW buses are entirely s390x specific)
At best this is a wishlist bug report against upstream z/VM & upstream qemu to expose something more realistic in the guest, which kernel then can pick up and display. What kernel is showing to you, is as much as it knows, and there is no bug there as far as I can tell.