OpenvSwitch

* ovs-vswitchd, a daemon that implements the switch, along with 
      a companion Linux kernel module for flow-based switching.

* ovsdb-server, a lightweight database server that ovs-vswitchd
      queries to obtain its configuration.

* ovs-brcompatd, a daemon that allows ovs-vswitchd to act as a
      drop-in replacement for the Linux bridge in many environments, 
      along with a companion Linux kernel module to intercept bridge 
      ioctls.

* ovs-dpctl, a tool for configuring the switch kernel module.

* Scripts and specs for building RPMs for Citrix XenServer and Red
      Hat Enterprise Linux.  The XenServer RPMs allow Open vSwitch to
      be installed on a Citrix XenServer host as a drop-in replacement
      for its switch, with additional functionality.

* ovs-vsctl, a utility for querying and updating the configuration
      of ovs-vswitchd.

* ovs-appctl, a utility that sends commands to running Open
      vSwitch daemons.

* ovsdbmonitor, a GUI tool for remotely viewing OVS databases and
      OpenFlow flow tables.

安裝注意事項

Open vSwitch可以用kernel modules來support以降低cost，或者可以安裝到userspace但是會增加performance的cost。