How to disable vhost-net driver for KVM guests ?

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Issue

How to Enable 'vhost' on Red Hat Enterprise Linux KVM guests to achieve wire speeds.
How to get the best network performance for a guest running virtio-net.

Environment

libvirt-0.8.7-2.el6
qemu-kvm-0.12.1.2-2.129.el6
kernel-2.6.32-94.el6
Red Hat Enterprise Linux 6.2 and later

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