"KVM as a "full virtualization" is a nice feature
because it allows you to run any operating system virtualized.
However, it's relatively slow because the hypervisor has to emulate
actual physical devices such as RTL8139 network cards and the most
recent SeaBios emulates IDE interface.This fragment from KVM guest
dmesg log is fair enough :-
"Virtio is a Linux standard for network and disk device drivers
where just the guest's device driver "knows" it is running in a
virtual environment, and cooperates with the hypervisor. This
enables guests to get high performance network and disk operations,
and gives most of the performance benefits of
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