X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=README;h=a0c9a2e1de450609921a04dd7a08cb1a4965e1a8;hb=7e56c85c02c547deda93ec09a589eae7e253fc58;hp=2bdbfdcf96f1a03009b08a7508ea4f449c9556f9;hpb=576e26d7b47f4e53116ef0b5f035d260f426d37b;p=openvswitch

diff --git a/README b/README
index 2bdbfdcf..a0c9a2e1 100644
--- a/README
+++ b/README
@@ -6,8 +6,8 @@ What is Open vSwitch?
 Open vSwitch is a multilayer software switch licensed under the open
 source Apache 2 license.  Our goal is to implement a production
 quality switch platform that supports standard management interfaces
-(e.g. NetFlow, RSPAN, ERSPAN, IOS-like CLI), and opens the forwarding
-functions to programmatic extension and control.
+(e.g. NetFlow, sFlow(R), RSPAN, ERSPAN, IOS-like CLI), and opens the
+forwarding functions to programmatic extension and control.
 
 Open vSwitch is well suited to function as a virtual switch in VM
 environments.  In addition to exposing standard control and visibility
@@ -20,7 +20,8 @@ The bulk of the code is written in platform-independent C and is
 easily ported to other environments.  The current release of Open
 vSwitch supports the following features:
 
-    * Visibility into inter-VM communication via NetFlow, SPAN, and RSPAN
+    * Visibility into inter-VM communication via NetFlow, sFlow, SPAN,
+      and RSPAN
     * Standard 802.1Q VLAN model with trunking
     * Per VM policing
     * NIC bonding with source-MAC load balancing
@@ -28,9 +29,15 @@ vSwitch supports the following features:
     * Support for OpenFlow
     * Compatibility layer for the Linux bridging code
 
-Open vSwitch supports Linux 2.6.15 and up, with testing focused on
-2.6.18 with Centos and Xen patches and version 2.6.26 from kernel.org.
-Open vSwitch also has special support for Citrix XenServer hosts.
+The included Linux kernel module supports Linux 2.6.15 and up, with
+testing focused on 2.6.18 with Centos and Xen patches and version
+2.6.26 from kernel.org.  Open vSwitch also has special support for
+Citrix XenServer hosts.
+
+Open vSwitch can also operate, at a cost in performance, entirely in
+userspace, without assistance from a kernel module.  This userspace
+implementation should be easier to port than the kernel-based switch.
+It is considered experimental.
 
 What's here?
 ------------
@@ -85,6 +92,9 @@ read INSTALL.bridge.
 To build RPMs for installing Open vSwitch on a Citrix XenServer host
 or resource pool, read INSTALL.XenServer.
 
+To install Open vSwitch without using a kernel module, read
+INSTALL.userspace.
+
 To learn set up SSL support for Open vSwitch, read INSTALL.SSL.
 
 Each Open vSwitch userspace program is accompanied by a manpage.  Many