[ovs-discuss] packet reorderoing

[Gray, Mark D]

> 
> On Wed, Feb 25, 2015 at 11:28:56AM -0600, swair shah wrote:
> > When packets which does not match any rule in ovs, are buffered at the
> > ingress switch, say first n packets are buffered. Switch sends a
> > flow_mod and message and packet_out for the buffered packets,
> > meanwhile if some more packets of the same flow arrive (say n+1 to m),
> > they'll also get buffered (as flow_mod) hasn't arrived yet.
> >
> > Once flow_mod message arrives at the switch then subsequent packets of
> > the flow will be forwarded but packets (n+1 to m) will still be
> > buffered waiting for their packet_outs. This results in reordering of
> packets.
> >
> > Is there a way around this, besides from proactively setting up a flow?
> >
> > Is there a way to match flow_mod to existing buffered packets?
> 
> Reordering can happen.  There isn't a way to avoid it entirely (besides
> proactive flow setup).  It isn't usually a problem, though, because most
> protocols only send one packet before they receive a reply from the
> opposite end.

The only way that I can think to nail up a flow is via dpctl. Is this how you
suggest to do this?