Add a note about synchronization timeout

Change-Id: I3a8c1a720ac0e29111397963131e00080ecfb07e

1 files changed, 8 insertions, 0 deletions

diff --git a/doc/source/configuration.rst b/doc/source/configuration.rst
index 580e237..2d5fa18 100644
--- a/doc/source/configuration.rst
+++ b/doc/source/configuration.rst
@@ -178,3 +178,11 @@ device to one, but the number may be configured per-device as follows::
     [genericswitch:device-hostname]
     ngs_max_connections = <max connections>
 
+When synchronization is used, each Neutron thread executing the
+networking-generic-switch plugin will attempt to acquire a lock, with a default
+timeout of 60 seconds before failing. This timeout can be configured as follows
+(setting it to 0 means no timeout)::
+
+    [ngs_coordination]
+    ...
+    acquire_timeout = <timeout in seconds>