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.

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https://bugs.launchpad.net/bugs/1572347

Title:
  problems with network speed reporting in sysfs on s390

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