This comes up from time to time.
Signed-off-by: Ben Pfaff <[email protected]>
---
FAQ.md | 20 ++++++++++++++++++++
1 file changed, 20 insertions(+)
diff --git a/FAQ.md b/FAQ.md
index 9e95d07..f7a0076 100644
--- a/FAQ.md
+++ b/FAQ.md
@@ -750,6 +750,26 @@ A: It's an expected behaviour.
ovs-vsctl add-port br0 p1 -- \
set interface p1 type=internal
+### Q: I want to add thousands of ports to an Open vSwitch bridge, but
+ it takes too long (minutes or hours) to do it with ovs-vsctl. How
+ can I do it faster?
+
+A: If you add them one at a time with ovs-vsctl, it can take a long
+ time to add thousands of ports to an Open vSwitch bridge. This is
+ because every invocation of ovs-vsctl first reads the current
+ configuration from OVSDB. As the number of ports grows, this
+ starts to take an appreciable amount of time, and when it is
+ repeated thousands of times the total time becomes significant.
+
+ The solution is to add the ports in one invocation of ovs-vsctl (or
+ a small number of them). For example, using bash:
+
+ ovs-vsctl add-br br0
+ cmds=; for i in {1..5000}; do cmds+=" -- add-port br0 p$i"; done
+ ovs-vsctl $cmds
+
+ takes seconds, not minutes or hours, in the OVS sandbox environment..
+
Quality of Service (QoS)
------------------------
--
2.1.3
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