[ovs-discuss] Iperf3 measurement problems through OVS

Zsolt Vági zsovagi at gmail.com
Mon Oct 22 10:06:12 UTC 2018


Dear OVS Community!

I work the following setup: on my server I run 5 VMs, 3 of which runs an
ovs on top of them.
Somewhat similar to this:
Server-->OVS-->OVS-->OVS-->Server
I try to measure the throughput between the two servers with iperf3. I can
see with tcmpdump, that the SYN packets go through my network and arrive to
the server on the right end, but it does not recognise them, and does not
send back a SYN-ACK. I've also tried to switch the roles so that the server
on the left becomes the iperf3 server, and the server on the right the
iperf3 client, but the same problem appears.
When I run the iperf3 client on the most right switch - which is directly
connected to the server on the right - the experiment works without any
problem. But as soon as there is at least 1 switch in between, I do not get
any results.

Can you please help me figure out the problem? Thank you in advance.


Kind Regards
Zsolt
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