diff --git a/nova/tests/unit/virt/libvirt/test_vif.py b/nova/tests/unit/virt/libvirt/test_vif.py
index e8fbb5429ec0..729b62098f4c 100644
--- a/nova/tests/unit/virt/libvirt/test_vif.py
+++ b/nova/tests/unit/virt/libvirt/test_vif.py
@@ -12,7 +12,6 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-import copy
 import os
 
 import fixtures
@@ -1618,59 +1617,3 @@ class LibvirtVifTestCase(test.NoDBTestCase):
                 <filterref
                  filter="nova-instance-instance-00000001-22522562e2aa"/>
             </interface>""", cfg.to_xml())
-
-    @mock.patch('nova.network.linux_net._set_device_mtu')
-    @mock.patch("nova.network.os_vif_util.nova_to_osvif_instance")
-    @mock.patch("nova.network.os_vif_util.nova_to_osvif_vif")
-    @mock.patch.object(os_vif, "plug")
-    def test_plug_ovs_vif_no_mtu(self, mock_plug,
-                              mock_convert_vif, mock_convert_inst,
-                              mock_set_mtu):
-        mock_convert_vif.return_value = self.os_vif_bridge
-        mock_convert_inst.return_value = self.os_vif_inst_info
-
-        d = vif.LibvirtGenericVIFDriver()
-        # Hack the network mtu in the vif_bridge object - make sure to copy it
-        # so we don't change state on a global object during a test run.
-        vif_bridge = copy.deepcopy(self.vif_bridge)
-        vif_bridge['network']._set_meta({'mtu': None})
-        d.plug(self.instance, vif_bridge)
-
-        self.assertFalse(mock_set_mtu.called)
-
-    @mock.patch('nova.network.linux_net._set_device_mtu')
-    @mock.patch("nova.network.os_vif_util.nova_to_osvif_instance")
-    @mock.patch("nova.network.os_vif_util.nova_to_osvif_vif")
-    @mock.patch.object(os_vif, "plug")
-    def test_plug_ovs_vif_mtu(self, mock_plug,
-                              mock_convert_vif, mock_convert_inst,
-                              mock_set_mtu):
-        # Hack port profile to say ovs, just like ovn
-        os_vif_bridge = copy.deepcopy(self.os_vif_bridge)
-        os_vif_bridge.port_profile = self.os_vif_ovs_prof
-        mock_convert_vif.return_value = os_vif_bridge
-        mock_convert_inst.return_value = self.os_vif_inst_info
-
-        d = vif.LibvirtGenericVIFDriver()
-        d.plug(self.instance, self.vif_bridge)
-
-        self.assertEqual(3, mock_set_mtu.call_count)
-        mock_set_mtu.assert_any_call("br0", 9000)
-        mock_set_mtu.assert_any_call("qvbdc065497-3c", 9000)
-        mock_set_mtu.assert_any_call("qvodc065497-3c", 9000)
-
-    @mock.patch('nova.network.linux_net._set_device_mtu')
-    @mock.patch("nova.network.os_vif_util.nova_to_osvif_instance")
-    @mock.patch("nova.network.os_vif_util.nova_to_osvif_vif")
-    @mock.patch.object(os_vif, "plug")
-    def test_plug_ovs_vif_no_mtu_venv(self, mock_plug,
-                              mock_convert_vif, mock_convert_inst,
-                              mock_set_mtu):
-        mock_convert_vif.return_value = self.os_vif_ovs
-        mock_convert_inst.return_value = self.os_vif_inst_info
-
-        d = vif.LibvirtGenericVIFDriver()
-        d.plug(self.instance, self.vif_ovs)
-
-        self.assertEqual(1, mock_set_mtu.call_count)
-        mock_set_mtu.assert_any_call("br0", 1000)
diff --git a/nova/virt/libvirt/vif.py b/nova/virt/libvirt/vif.py
index 5339a7b50f6d..059d212a5735 100644
--- a/nova/virt/libvirt/vif.py
+++ b/nova/virt/libvirt/vif.py
@@ -775,7 +775,7 @@ class LibvirtGenericVIFDriver(object):
         except processutils.ProcessExecutionError:
             LOG.exception(_LE("Failed while plugging vif"), instance=instance)
 
-    def _plug_os_vif(self, instance, vif, raw_vif):
+    def _plug_os_vif(self, instance, vif):
         instance_info = os_vif_util.nova_to_osvif_instance(instance)
 
         try:
@@ -785,22 +785,6 @@ class LibvirtGenericVIFDriver(object):
                    % {'ex': ex})
             raise exception.NovaException(msg)
 
-        # TODO(johngarbutt) remove this hack once 1623876 is fixed in os-vif
-        network = raw_vif.get('network')
-        mtu = network.get_meta('mtu') if network else None
-        if mtu is not None:
-            linux_net._set_device_mtu(network["bridge"], mtu)
-
-        if (type(vif) == os_vif.objects.vif.VIFBridge and
-            hasattr(vif, "port_profile") and
-            isinstance(vif.port_profile,
-                       os_vif.objects.vif.VIFPortProfileOpenVSwitch)):
-            veths = [
-                ("qvb%s" % vif.id)[:network_model.NIC_NAME_LEN],
-                ("qvo%s" % vif.id)[:network_model.NIC_NAME_LEN]]
-            for veth in veths:
-                linux_net._set_device_mtu(veth, mtu)
-
     def plug(self, instance, vif):
         vif_type = vif['type']
 
@@ -817,7 +801,7 @@ class LibvirtGenericVIFDriver(object):
         # Try os-vif codepath first
         vif_obj = os_vif_util.nova_to_osvif_vif(vif)
         if vif_obj is not None:
-            self._plug_os_vif(instance, vif_obj, vif)
+            self._plug_os_vif(instance, vif_obj)
             return
 
         # Legacy non-os-vif codepath