RARE user and assistance email list

[mc36 <>]

hi,
my first guess is that you're hitting the software forwarder's limits?
do you have excessive packets on eth0?
then, are the dataplane programmed properly?
are the table entries in place and consistent with the polka sho outputs?
if not that then do we still have jumbos in the lab?

and once again, please address the list first, not my telegram nor me 
personally...
this is again a kind of a question that anybody on the list will ask you...
thanks,
cs


-------- Forwarded Message --------
Subject:  Testing Polka and SRMPLS
Date:  Wed, 24 Aug 2022 12:24:26 -0300
From:  Everson Borges <>
To:  cs <>



Hi Csaba,

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