[ovs-discuss] Can't use queues with OVS when adding delay to links with Mininet

[Giuseppe Cofano]

I had the same issue some time ago. Probably you cannot use Mininet tc and
ovs queues together, because both are based on HTB. There is a conflict.

Giuseppe

Giuseppe Cofano, PhD
Dipartimento di Ing. Elettrica e dell'Informazione
Politecnico di Bari, Italy
Via Orabona 4, 70125 Bari Italy
 +39 080 596 3851
 giuseppe.cofano at poliba.it <g.cofano at poliba.it>; g.cofano87 at gmail.com

2016-05-02 17:33 GMT+02:00 Ben Pfaff <blp at ovn.org>:

> On Sat, Apr 30, 2016 at 08:55:41PM +0200, Guillermo Chica wrote:
> > Hi,
> >
> > I have created a topology with mininet. When I've added the links, I've
> > used the delay parameter, as in self.addLink( node1, node2, delay='5ms').
> > After running the topology with sudo mn --custom topo5g.py --topo topo5g
> > --switch ovsk --controller remote --mac --arp --link tc
> >
> > I have created a qos for a switch and I have added the flows to force
> > traffic to go through these queues, like this:
> >
> > sudo ovs-vsctl -- set Port s1-eth1 qos=@newqos -- set Port s1-eth2
> > qos=@newqos -- --id=@newqos create QoS type=linux-htb
> > other-config:max-rate=100000 queues=0=@q0,1=@q1 -- --id=@q0 create Queue
> > other-config:min-rate=100000 other-config:max-rate=100000 -- --id=@q1
> > create Queue other-config:min-rate=1000 other-config:max-rate=1000
> >
> > sudo ovs-ofctl add-flow s1
> >
> in_port=2,dl_type=0x0800,nw_proto=6,nw_src=10.0.0.8,nw_dst=10.0.0.4,tp_src=333,priority=100,actions=enqueue:1:1
> > sudo ovs-ofctl add-flow s1
> >
> in_port=1,dl_type=0x0800,nw_proto=6,nw_src=10.0.0.4,nw_dst=10.0.0.8,tp_dst=333,priority=100,actions=enqueue:
> >
> > However, when I use sudo ovs-ofctl queue-stats s1, I obtain this answer:
> > OFPST_QUEUE reply (xid=0x2): 0 queues.
> >
> > And obviously the QoS does not work.
> >
> > This does not happen when I don't use the delay parameter in mininet. If
> I
> > don't define a delay in mininet, the queues exist and the QoS works fine.
> > Why is that? Can't I have queues and control delay at the same time?
>
> I guess that mininet implements delay via some form of QoS.  You might
> be more likely to get a useful answer on a mininet mailing list.
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