faq: Expand on answer about packet buffering removal.
Acked-by: Andy Zhou
@@ -462,6 +462,15 @@ What's going on?
messages and will send an error response if any other value of this field
is included in a "packet-out" or a "flow mod" sent by a controller.
+ Packet buffers have limited usefulness in any case. Table-miss packet-in
+ messages most commonly pass the first packet in a microflow to the OpenFlow
+ controller, which then sets up an OpenFlow flow that handles remaining
+ traffic in the microflow without further controller intervention. In such
+ a case, the packet that initiates the microflow is in practice usually
+ small (certainly for TCP), which means that the switch sends the entire
+ packet to the controller and the buffer only saves a small number of bytes
+ in the reverse direction.
+
Q: How does OVS divide flows among buckets in an OpenFlow "select" group?
A: In Open vSwitch 2.3 and earlier, Open vSwitch used the destination
