Hi,
When I use iperf to measure the bandwidth between two end hosts in Mininet
with Ryu, the bandwidth is lower than link capacity as defined in Mininet
seriously. The related information about my experiment is shown in below:
topology in Mininet: sudo mn --controller remote --switch
ovs,protocols=OpenFlow13 --link tc,bw=10 --topo tree,depth=3 --mac
ryu: simple_switch_13
the test results are:
/**********************
mininet> iperf h1 h8
*** Iperf: testing TCP bandwidth between h1 and h8
*** Results: ['2.60 Mbits/sec', '2.93 Mbits/sec']
mininet> iperf h1 h8
*** Iperf: testing TCP bandwidth between h1 and h8
*** Results: ['2.55 Mbits/sec', '2.87 Mbits/sec']
**************************/
The end-to-end bandwidth measured is only 2.93Mbits, which is lower than
10Mbits/sec seriously.
When I use a single switch topo: sudo mn --controller remote --switch
ovs,protocols=OpenFlow13 --link tc,bw=10 --mac
the results are:
/************************
*** Iperf: testing TCP bandwidth between h1 and h2
*** Results: ['9.78 Mbits/sec', '10.4 Mbits/sec']
**********************/
I don't know why the bandwidth is so small than defined
Any help is much appreciated.
Thanks!
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