Code review comment for lp:~bgh/neutron/bug850261

hey, guys，I'am using openvswitch + nova,but without quantum,just adding flags:
"--linuxnet_ovs_integration_bridge=ovs-br"
"--linuxnet_interface_driver=nova.network.linux_net.LinuxOVSInterfaceDriver"
"--libvirt_vif_type=ethernet"
"--libvirt_vif_driver=nova.virt.libvirt.vif.LibvirtOpenVswitchDriver"

to ovs,I wrote a script to add modules(openvswitch_mod.ko & brcompat_mod.ko) and "ovs-vsctl add-br ovs-br"

Then euca-run-instances, it's ok.
So, can someone tell me,why to choose quantum as a ovs plugin in openstack, or it can do something better than I'm doing now?