On Tue, Aug 25, 2015, at 01:53 PM, Jan Just Keijser wrote:
> can you try it without the mssfix setting as well ?

(1)

SERVER
        /openvpn.conf   
                ...
                mssfix 1432
                ...
        iperf3 --server --port 56789 --bind 10.0.0.1

CLIENT
        /openvpn.conf   
                ...
                mssfix 1432
                ...
        iperf3 -c 10.0.0.1 -u -p 56789 -t 30


Accepted connection from 10.0.0.2, port 57223
[  5] local 10.0.0.1 port 56789 connected to 10.0.0.2 port 54046
[ ID] Interval           Transfer     Bandwidth       Jitter    Lost/Total 
Datagrams
[  5]   0.00-1.00   sec   104 KBytes   852 Kbits/sec  15.984 ms  0/13 (0%)  
[  5]   1.00-2.00   sec   128 KBytes  1.05 Mbits/sec  24.540 ms  0/16 (0%)  
[  5]   2.00-3.00   sec   128 KBytes  1.05 Mbits/sec  27.593 ms  0/16 (0%)  
[  5]   3.00-4.00   sec   128 KBytes  1.05 Mbits/sec  28.675 ms  0/16 (0%)  
[  5]   4.00-5.00   sec   128 KBytes  1.05 Mbits/sec  29.123 ms  0/16 (0%)  
[  5]   5.00-6.00   sec   128 KBytes  1.05 Mbits/sec  29.434 ms  0/16 (0%)  
[  5]   6.00-7.00   sec   128 KBytes  1.05 Mbits/sec  29.155 ms  0/16 (0%)  
[  5]   7.00-8.00   sec   128 KBytes  1.05 Mbits/sec  28.954 ms  0/16 (0%)  
[  5]   8.00-9.00   sec   128 KBytes  1.05 Mbits/sec  29.331 ms  0/16 (0%)  
[  5]   9.00-10.00  sec   128 KBytes  1.05 Mbits/sec  29.137 ms  0/16 (0%)  
[  5]  10.00-11.00  sec   128 KBytes  1.05 Mbits/sec  29.129 ms  0/16 (0%)  
[  5]  11.00-12.00  sec   128 KBytes  1.05 Mbits/sec  29.177 ms  0/16 (0%)  
[  5]  12.00-13.00  sec   128 KBytes  1.05 Mbits/sec  28.933 ms  0/16 (0%)  
[  5]  13.00-14.00  sec   128 KBytes  1.05 Mbits/sec  29.017 ms  0/16 (0%)  
[  5]  14.00-15.00  sec   128 KBytes  1.05 Mbits/sec  29.113 ms  0/16 (0%)  
[  5]  15.00-16.00  sec   128 KBytes  1.05 Mbits/sec  29.068 ms  0/16 (0%)  
[  5]  16.00-17.00  sec   128 KBytes  1.05 Mbits/sec  29.100 ms  0/16 (0%)  
[  5]  17.00-18.00  sec   128 KBytes  1.05 Mbits/sec  29.077 ms  0/16 (0%)  
[  5]  18.00-19.00  sec   128 KBytes  1.05 Mbits/sec  29.116 ms  0/16 (0%)  
[  5]  19.00-20.00  sec   128 KBytes  1.05 Mbits/sec  29.150 ms  0/16 (0%)  
[  5]  20.00-21.00  sec   128 KBytes  1.05 Mbits/sec  29.167 ms  0/16 (0%)  
[  5]  21.00-22.00  sec   128 KBytes  1.05 Mbits/sec  29.101 ms  0/16 (0%)  
[  5]  22.00-23.00  sec   128 KBytes  1.05 Mbits/sec  29.336 ms  0/16 (0%)  
[  5]  23.00-24.00  sec   128 KBytes  1.05 Mbits/sec  28.895 ms  0/16 (0%)  
[  5]  24.00-25.00  sec   128 KBytes  1.05 Mbits/sec  28.962 ms  0/16 (0%)  
[  5]  25.00-26.00  sec   128 KBytes  1.05 Mbits/sec  29.077 ms  0/16 (0%)  
[  5]  26.00-27.00  sec   128 KBytes  1.05 Mbits/sec  29.149 ms  0/16 (0%)  
[  5]  27.00-28.00  sec   128 KBytes  1.05 Mbits/sec  29.177 ms  0/16 (0%)  
[  5]  28.00-29.00  sec   128 KBytes  1.05 Mbits/sec  29.102 ms  0/16 (0%)  
[  5]  29.00-30.00  sec   128 KBytes  1.05 Mbits/sec  29.107 ms  0/16 (0%)  
[  5]  30.00-30.06  sec  16.0 KBytes  2.05 Mbits/sec  27.973 ms  0/2 (0%)  
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bandwidth       Jitter    Lost/Total 
Datagrams
[  5]   0.00-30.06  sec  3.74 MBytes  1.04 Mbits/sec  27.973 ms  0/479 (0%)  


(2)

SERVER

        /openvpn.conf   
                ...
-               mssfix 1432
+               #mssfix 1432
                ...
        iperf3 --server --port 56789 --bind 10.0.0.1

CLIENT

        /openvpn.conf   
                ...
-               mssfix 1432
+               #mssfix 1432
                ...
        iperf3 -c 10.0.0.1 -u -p 56789 -t 30

Accepted connection from 10.0.0.2, port 57226
[  5] local 10.0.0.1 port 56789 connected to 10.0.0.2 port 32982
[ ID] Interval           Transfer     Bandwidth       Jitter    Lost/Total 
Datagrams
[  5]   0.00-1.00   sec   104 KBytes   852 Kbits/sec  15.999 ms  0/13 (0%)  
[  5]   1.00-2.00   sec   128 KBytes  1.05 Mbits/sec  24.483 ms  0/16 (0%)  
[  5]   2.00-3.00   sec   128 KBytes  1.05 Mbits/sec  27.236 ms  0/16 (0%)  
[  5]   3.00-4.00   sec   128 KBytes  1.05 Mbits/sec  28.491 ms  0/16 (0%)  
[  5]   4.00-5.00   sec   128 KBytes  1.05 Mbits/sec  28.843 ms  0/16 (0%)  
[  5]   5.00-6.00   sec   128 KBytes  1.05 Mbits/sec  29.101 ms  0/16 (0%)  
[  5]   6.00-7.00   sec   128 KBytes  1.05 Mbits/sec  29.085 ms  0/16 (0%)  
[  5]   7.00-8.00   sec   128 KBytes  1.05 Mbits/sec  29.121 ms  0/16 (0%)  
[  5]   8.00-9.00   sec   128 KBytes  1.05 Mbits/sec  29.290 ms  0/16 (0%)  
[  5]   9.00-10.00  sec   128 KBytes  1.05 Mbits/sec  29.235 ms  0/16 (0%)  
[  5]  10.00-11.00  sec   128 KBytes  1.05 Mbits/sec  28.908 ms  0/16 (0%)  
[  5]  11.00-12.00  sec   128 KBytes  1.05 Mbits/sec  29.071 ms  0/16 (0%)  
[  5]  12.00-13.00  sec   128 KBytes  1.05 Mbits/sec  29.137 ms  0/16 (0%)  
[  5]  13.00-14.00  sec   128 KBytes  1.05 Mbits/sec  29.137 ms  0/16 (0%)  
[  5]  14.00-15.00  sec   128 KBytes  1.05 Mbits/sec  29.098 ms  0/16 (0%)  
[  5]  15.00-16.00  sec   128 KBytes  1.05 Mbits/sec  29.115 ms  0/16 (0%)  
[  5]  16.00-17.00  sec   120 KBytes   983 Kbits/sec  26.980 ms  1/16 (6.2%)  
[  5]  17.00-18.00  sec   128 KBytes  1.05 Mbits/sec  28.344 ms  0/16 (0%)  
[  5]  18.00-19.00  sec   128 KBytes  1.05 Mbits/sec  28.807 ms  0/16 (0%)  
[  5]  19.00-20.00  sec   128 KBytes  1.05 Mbits/sec  28.915 ms  0/16 (0%)  
[  5]  20.00-21.00  sec   128 KBytes  1.05 Mbits/sec  29.017 ms  0/16 (0%)  
[  5]  21.00-22.00  sec   128 KBytes  1.05 Mbits/sec  29.085 ms  0/16 (0%)  
[  5]  22.00-23.00  sec   128 KBytes  1.05 Mbits/sec  29.158 ms  0/16 (0%)  
[  5]  23.00-24.00  sec   128 KBytes  1.05 Mbits/sec  29.113 ms  0/16 (0%)  
[  5]  24.00-25.00  sec   128 KBytes  1.05 Mbits/sec  29.030 ms  0/16 (0%)  
[  5]  25.00-26.00  sec   128 KBytes  1.05 Mbits/sec  28.912 ms  0/16 (0%)  
[  5]  26.00-27.00  sec   128 KBytes  1.05 Mbits/sec  29.066 ms  0/16 (0%)  
[  5]  27.00-28.00  sec   128 KBytes  1.05 Mbits/sec  29.160 ms  0/16 (0%)  
[  5]  28.00-29.00  sec   128 KBytes  1.05 Mbits/sec  29.221 ms  0/16 (0%)  
[  5]  29.00-30.00  sec   128 KBytes  1.05 Mbits/sec  29.217 ms  0/16 (0%)  
[  5]  30.00-30.07  sec  16.0 KBytes  2.02 Mbits/sec  28.080 ms  0/2 (0%)  
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bandwidth       Jitter    Lost/Total 
Datagrams
[  5]   0.00-30.07  sec  3.74 MBytes  1.04 Mbits/sec  28.080 ms  1/479 (0.21%)  

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