[ovs-discuss] OVS 2.8.1 changes the rates of data packets!

[Dawood Sajjadi]

when I remove the wireless interfaces from the bridge, there is no problem.
However, as soon as adding the wireless interfaces to the bridge, the
problem shows up. So, it seems OVS (at least) is a part of the problem.

On Fri, Dec 8, 2017 at 5:55 PM, Ben Pfaff <blp at ovn.org> wrote:

> On December 8, 2017 5:53:44 PM PST, Dawood Sajjadi <s.d.sajjadi at gmail.com>
> wrote:
>>
>> I created a bridge using OVS 2.8.1 in Ubuntu 14.04. The bridge contains 4
>> physical ports including one ethernet and three wireless ports. The
>> ethernet port is connected to a laptop that generated dummy traffic using
>> Iperf. So, the ethernet port is used as the incoming port and the generated
>> traffic leaves the bridge through the wireless (as the outgoing) ports. I
>> used tcpdump to capture the traffic at the incoming and outgoing ports of
>> the bridge and I noticed that the volume of the outgoing traffic (at the
>> wireless ports) is by far lower than the amount of the incoming traffic
>> (from the ethernet port). It seems the OVS bridge drops/limits the rate of
>> outgoing packets. For instance, if the size of the captured traffic using
>> tcpdump at eth0 is 15 MB, the total size of the captured traffic on
>> wireless ports is 3 MB!
>>
>> I didn't make any change in the default configuration of the OVS. Also,
>> to ensure that there is no predefined Queue/QoS policy at the bridge, I
>> used "ovs-vsctl --all destroy qos && ovs-vsctl --all destroy queue"
>> command. However, the problem persists! Has anyone encountered such an
>> issue before? I really appreciate having your feedback. Thanks.
>>
>
> OVS doesn't change data rates. You should try to figure out what's going
> on without making that assumption.
>
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