RARE user and assistance email list

[Everson Borges <>]

Hi All,

To explain to you some odd results that I got in my tests with PolKA in the P4LAB using iperf3.

Via the longest path (AMS0001--POZ0001--BUD00001--FRA0001), when I send flows from the DTN1 to DTN2, the iperf3 shows off many packet losses by using the PolKA tunnel.

Even though I look in the DTNs to see if they had a problem, I don't find anything; nevertheless, when I use SR-MPLS, this problem disappears. So I would like to ask if you could
help me sort out this problem?

One step in investigating the problem was regarding the packet's size; however, I have tested different sizes,   from 100 to 1400, and the problem keeps happening.

*Using PolKA Tunnel*
root@ams-bms6:~# iperf3 -c 10.2.101.101 -S 0x20 -b 500M -l 1000
Connecting to host 10.2.101.101, port 5201
[   5] local 10.1.101.101 port 60020 connected to 10.2.101.101 port 5201
[ ID] Interval                Transfer       Bitrate                                 Retr   Cwnd
[   5]    0.00-1.00    sec   2.02 MBytes   17.0 Mbits/sec      0      124 KBytes
[   5]    1.00-2.00    sec   6.74 MBytes   56.5 Mbits/sec      0      413 KBytes
[   5]    2.00-3.00    sec   17.0 MBytes    143 Mbits/sec    55      768 KBytes
[   5]    3.00-4.00    sec   17.7 MBytes    149 Mbits/sec    17      604 KBytes
[   5]    4.00-5.00    sec   14.6 MBytes    123 Mbits/sec      0      653 KBytes
[   5]    5.00-6.00    sec   15.7 MBytes    131 Mbits/sec      0      689 KBytes
[   5]    6.00-7.00    sec   16.2 MBytes    136 Mbits/sec      0      708 KBytes
[   5]    7.00-8.00    sec   16.7 MBytes    140 Mbits/sec      0      720 KBytes
[   5]    8.00-9.00    sec   16.8 MBytes    141 Mbits/sec      0      723 KBytes
[   5]    9.00-10.00   sec   16.9 MBytes    141 Mbits/sec      0      723 KBytes
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval                Transfer       Bitrate             Retr
[   5]    0.00-10.00   sec    140 MBytes    118 Mbits/sec *72 *                  sender
[   5]    0.00-10.02   sec    138 MBytes    116 Mbits/sec                           receiver

iperf Done.


*Using SR-MPLS tunnel*
root@ams-bms6:~# iperf3 -c 10.2.101.101 -S 0x40 -b 500M -l 100
Connecting to host 10.2.101.101, port 5201
[   5] local 10.1.101.101 port 60054 connected to 10.2.101.101 port 5201
[ ID] Interval                Transfer       Bitrate                                 Retr   Cwnd
[   5]    0.00-1.00    sec   1.47 MBytes   12.3 Mbits/sec      0      110 KBytes
[   5]    1.00-2.00    sec   3.57 MBytes   29.9 Mbits/sec      0      264 KBytes
[   5]    2.00-3.00    sec   8.68 MBytes   72.8 Mbits/sec      0      635 KBytes
[   5]    3.00-4.00    sec   17.6 MBytes    148 Mbits/sec      0    1.48 MBytes
[   5]    4.00-5.00    sec   25.4 MBytes    213 Mbits/sec      0    1.72 MBytes
[   5]    5.00-6.00    sec   25.7 MBytes    216 Mbits/sec      0    1.72 MBytes
[   5]    6.00-7.00    sec   25.7 MBytes    216 Mbits/sec      0    1.72 MBytes
[   5]    7.00-8.00    sec   25.7 MBytes    216 Mbits/sec      0    1.72 MBytes
[   5]    8.00-9.00    sec   25.7 MBytes    216 Mbits/sec      0    1.72 MBytes
[   5]    9.00-10.00   sec   25.6 MBytes    215 Mbits/sec      0    1.72 MBytes
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval                Transfer       Bitrate             Retr
[   5]    0.00-10.00   sec    185 MBytes    155 Mbits/sec      0                   sender
[   5]    0.00-10.03   sec    184 MBytes    154 Mbits/sec                           receiver

iperf Done.


--
Best regards,
Everson