1. I am using the userspace mode of ovs. When I execute the following
commands to start the ovs daemon, I got one error and one warning are
shown below. It looks that the ovs daemon is started and able to
perform learning switch functionality. Just want to check if I can
safely ignore them due to the userspace mode of ovs?

ovsdb-server --remote=punix:/usr/local/var/run/openvswitch/db.sock
--remote=db:Open_vSwitch,manager_options --pidfile --detach;
ovs-vsctl --no-wait init;
ovs-vswitchd --pidfile --detach

Jun 07 
06:01:39|00001|reconnect|INFO|unix:/usr/local/var/run/openvswitch/db.sock:
connecting...
Jun 07 
06:01:39|00002|reconnect|INFO|unix:/usr/local/var/run/openvswitch/db.sock:
connected
Jun 07 06:01:39|00003|dpif_linux|ERR|Generic Netlink family
'ovs_datapath' does not exist. The Open vSwitch kernel module is
probably not loaded.
Jun 07 06:01:39|00004|dpif|WARN|failed to enumerate system datapaths:
No such file or directory

2. I applied the following rate limiting rules (no error is shown
after executing the commands),  but the rate limiting does not work. I
can send 100 Mb/s traffic from one host to another. just wondering if
it is because the userspace mode does not support QoS?

ovs-vsctl set Interface tap0 ingress_policing_rate=1000
ovs-vsctl set Interface tap0 ingress_policing_burst=100

my topology
VM1 (eth0) --- (eth0) VM2 (eth1) --- (eth0)VM3
the ovs needs to run inside VM2 for some reason of our project.
The virtualization technology I used is OpenVZ, which is a OS-level
virtualization. Therefore, I am not able to load any kernel module in
VM, and I choose to run userspace mode of ovs.

Thank you for your help.
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