[ovs-discuss] Queues Issues

[Savvas Zannettou]

Hi all,

I am trying to create a QoS mechanism using Mininet and OVS. More
specifically i have 2 flows with different DSCP values and i want to
prioritize the one over the other. I executed the following commands:

sudo ovs-vsctl set port s2-eth2 qos=@newqos -- --id=@newqos create qos
type=linux-htb queues=0=@q0,1=@q1 -- --id=@q0 create queue
other-config:min-rate=0 -- --id=@q1 create queue
other-config:min-rate=7000000

sudo ovs-ofctl add-flow s2 tcp,nw_tos=0,actions=enqueue=2:0,normal

sudo ovs-ofctl add-flow s2 tcp,nw_tos=184,actions=enqueue=2:1,normal

The idea is when a flow have tos value equal to 184 to get at least
7Mbits/s out of 10Mbits/s.

In my test i execute 2 iperfs (almost simultaneously), the one with tos=0
and the other with tos=184 and the results are inconsistent. The results
are shown in the attached image(left is the host with tos=184 and right the
host with tos=0)

Does anyone knows why i don't get the desired results? Do i have to do
something different in order to achieve my goal?
Note that the 2 queues are used because when i dump the flows of s2 i see
that the n_packets field of the 2 queues are greater than 0.

Thanks in advance,
Savvas
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