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Packet-in buffering

As it relates to reactive flow's, let's say the openflow switch I'm using doesn't support buffering packets while the packet-in is sent to the ODL controller. In that case, I would need to rely on ODL to do the buffering of said packet-in's correct? Is the size of that buffer configurable? Is there a way to see how many packets are in said buffer at any given time? Last question, when does ODL turn that packet-in into a packet-out? when it see's a matching flow and sends a flow-mod?

Thanks!