FAQ: Add entry describing upgrade order between userspace and kernel.

There will be significant changes for tunneling between 1.9 and 1.10
so this describes how to smoothly upgrade.

Suggested-by: Ben Pfaff <blp@nicira.com>
Signed-off-by: Jesse Gross <jesse@nicira.com>

diff --git a/FAQ b/FAQ
index 9fb60f7..1a2c4f8 100644 (file)
--- a/FAQ
+++ b/FAQ
@@ -154,6 +154,14 @@ A: The following table lists the Linux kernel versions against which the
    It should build against almost any kernel, certainly against 2.6.18
    and later.
 
    It should build against almost any kernel, certainly against 2.6.18
    and later.
 

+Q: Should userspace or kernel be upgraded first to minimize downtime?
+
+   In general, the Open vSwitch userspace should be used with the
+   kernel version included in the same release or with the version
+   from upstream Linux.  However, when upgrading between two releases
+   of Open vSwitch it is best to migrate userspace first to reduce
+   the possbility of incompatibilities.
+

 Q: What features are not available in the Open vSwitch kernel datapath
    that ships as part of the upstream Linux kernel?
 
 Q: What features are not available in the Open vSwitch kernel datapath
    that ships as part of the upstream Linux kernel?