Hi,
When I set two priority queues in OVS and use two TCP flows from different ,
I find that the TCP flow with high priority queue cannot enjoy priority in
forwarding its packet, but just fairly share the available bandwidth with
another TCP flow.
I use the topology in the below, each link bandwidth is 10Mbps. Two TCP
flows f1 (host1-->host3, tos=4, queue=7) and f2 (host2-->host4, tos=1, queue=0).
host1----(port1)OVS1(port3)---------OVS2------------------host3
| |
host2 host4
I set up two priority in each OVS port like this:
sudo ovs-vsctl -- set Port OVS-port3 qos=@newqos --
--id=@newqos create QoS type=linux-htb
other-config:max-rate=10000000 queues=0=@q0, 7=@q7 --
--id=@q0 create Queue other-config:priority=1 --
--id=@q7 create Queue other-config:priority=1
I firstly send f2 with iperf with set tos=0, and send f1 in 20s later with set
tos=4.
I think when f1 is sent, f2 will slow down. However, each flow's transmitting
rate is around 4.7Mbps, which doesn't reflect the function of priority queues.
Moreover, when I set f2 to be UDP flow (host2-->host4, tos=1, queue=0) with
sending bandwidth=10Mbps, the UDP flow's transmitting rate is still around
3.25Mbps, which doesn't accord with priority queue principle. I don't know
what's the matter?
I find some information in ovs-vswitchd.conf.db(5), and it says:
Configuration for linux-htb QoS:
other_config : min-rate optional string, containing an integer, at least 1
other_config : max-rate optional string, containing an integer, at least 1
other_config : burst optional string, containing an integer, at least 1
other_config : priority optional string, containing an integer, in range 0 to
4,294,967,295
which mean I can set priority queues in OVS?
Thanks for any help.
Bo Liu
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