dolphs

Please refer to this topic rgd issue 1)
Also to create some more awareness I contacted "Allwinner Customer Service Team" recently and they made this a Xunlong issue,
their response: " After a short discussion internally, we suggest you contact Xunlong for clarification.
Let's hope for a satisfactory solution, little/ some hope this can be increased as Xunlog is partnering with armbian ... ...
 
let's keep fingers crossed...

omg, let's bump dev to 5.05 ( current kernel ) and build a fresh debian image.
Mr martinayotte, I should like to express my respect to you for your work!
Will check back later as duty calls ( cooking for the wife ;-) )

hi running armbian ( kernel 4.14 ) and ovpn 2.4.6 and both nanopi neo2 boards.
ovpn is configured with cipher AES-128-CBC and auth SHA256, following results can be seen:

 
top - 04:53:47 up 26 days, 11:42,  2 users,  load average: 0.16, 0.16, 0.09 Tasks: 102 total,   2 running,  57 sleeping,   0 stopped,   0 zombie %Cpu0  :  1.0 us,  1.0 sy,  0.0 ni, 98.0 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st %Cpu1  :  1.0 us,  2.0 sy,  0.0 ni, 97.0 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st %Cpu2  : 20.7 us, 30.1 sy,  0.0 ni, 43.5 id,  0.0 wa,  0.0 hi,  5.7 si,  0.0 st %Cpu3  :  0.3 us,  0.3 sy,  0.0 ni, 99.0 id,  0.0 wa,  0.0 hi,  0.3 si,  0.0 st KiB Mem :   494152 total,   128980 free,    92528 used,   272644 buff/cache KiB Swap:   247072 total,   229664 free,    17408 used.   382416 avail Mem   PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND  1191 root      20   0   10180   6132   5324 R  59.1  1.2 137:16.90 openvpn  
and following with single thread " iperf3 -4 -V -c 192.168.10.2 -t 60 -b 0 -P 1 "
 
iperf 3.1.3 Linux vpn01 4.14.70-sunxi64 #274 SMP Wed Sep 19 12:09:30 CEST 2018 aarch64 Time: Sun, 09 Dec 2018 02:53:07 GMT Connecting to host 192.168.10.2, port 5201       Cookie: vpn01.1544323987.071807.somewhat       TCP MSS: 1276 (default) [  4] local 10.8.0.2 port 63472 connected to 192.168.10.2 port 5201 Starting Test: protocol: TCP, 1 streams, 131072 byte blocks, omitting 0 seconds, 60 second test [ ID] Interval           Transfer     Bandwidth       Retr  Cwnd [  4]   0.00-1.00   sec  9.07 MBytes  75.9 Mbits/sec  199   1.24 MBytes [  4]   1.00-2.00   sec  8.75 MBytes  73.4 Mbits/sec  166   1.09 MBytes [  4]   2.00-3.00   sec  12.5 MBytes   105 Mbits/sec    0   1.35 MBytes [  4]   3.00-4.00   sec  7.50 MBytes  62.9 Mbits/sec    0   1.36 MBytes [  4]   4.00-5.00   sec  7.50 MBytes  62.9 Mbits/sec   54   1.22 MBytes [  4]   5.00-6.00   sec  8.75 MBytes  73.4 Mbits/sec    0   1.22 MBytes [  4]   6.00-7.00   sec  7.50 MBytes  62.8 Mbits/sec    0   1.24 MBytes [  4]   7.00-8.00   sec  8.75 MBytes  73.5 Mbits/sec    0   1.16 MBytes [  4]   8.00-9.00   sec  8.75 MBytes  73.3 Mbits/sec    0   1.21 MBytes [  4]   9.00-10.00  sec  11.2 MBytes  94.4 Mbits/sec    0   1.41 MBytes [  4]  10.00-11.00  sec  8.75 MBytes  73.4 Mbits/sec    3   1.59 MBytes [  4]  11.00-12.00  sec  7.50 MBytes  63.0 Mbits/sec   46   1.58 MBytes [  4]  12.00-13.00  sec  10.0 MBytes  83.9 Mbits/sec    0   1.27 MBytes [  4]  13.00-14.00  sec  7.50 MBytes  62.9 Mbits/sec   25   1.17 MBytes [  4]  14.00-15.00  sec  11.2 MBytes  94.4 Mbits/sec    0   1.40 MBytes [  4]  15.00-16.00  sec  11.2 MBytes  94.4 Mbits/sec   15    616 KBytes [  4]  16.00-17.00  sec  6.25 MBytes  52.4 Mbits/sec    9   1.25 MBytes [  4]  17.00-18.00  sec  8.75 MBytes  73.4 Mbits/sec  252   1.15 MBytes [  4]  18.00-19.00  sec  7.50 MBytes  62.9 Mbits/sec    0   1.24 MBytes [  4]  19.00-20.00  sec  10.0 MBytes  83.8 Mbits/sec   29    684 KBytes [  4]  20.00-21.00  sec  7.50 MBytes  62.9 Mbits/sec    0   1.24 MBytes [  4]  21.00-22.00  sec  7.50 MBytes  62.9 Mbits/sec  194   1.26 MBytes [  4]  22.00-23.00  sec  8.75 MBytes  73.4 Mbits/sec    0   1.25 MBytes [  4]  23.00-24.00  sec  7.50 MBytes  62.9 Mbits/sec    0   1.16 MBytes [  4]  24.00-25.00  sec  12.5 MBytes   105 Mbits/sec    0   1.43 MBytes [  4]  25.00-26.00  sec  6.25 MBytes  52.4 Mbits/sec   46   1.42 MBytes [  4]  26.00-27.00  sec  8.75 MBytes  73.4 Mbits/sec    0   1.40 MBytes [  4]  27.00-28.00  sec  8.75 MBytes  73.4 Mbits/sec   18   1.24 MBytes [  4]  28.00-29.00  sec  8.75 MBytes  73.4 Mbits/sec    0   1.23 MBytes [  4]  29.00-30.00  sec  10.0 MBytes  83.9 Mbits/sec    0   1.37 MBytes [  4]  30.00-31.00  sec  7.50 MBytes  62.9 Mbits/sec    0   1.26 MBytes [  4]  31.00-32.00  sec  8.75 MBytes  73.4 Mbits/sec   64   1.15 MBytes [  4]  32.00-33.00  sec  8.75 MBytes  73.4 Mbits/sec    0   1.16 MBytes [  4]  33.00-34.00  sec  10.0 MBytes  83.9 Mbits/sec    0   1.34 MBytes [  4]  34.00-35.00  sec  8.75 MBytes  73.4 Mbits/sec    0   1.34 MBytes [  4]  35.00-36.00  sec  8.75 MBytes  73.4 Mbits/sec    0   1.26 MBytes [  4]  36.00-37.00  sec  8.75 MBytes  73.4 Mbits/sec    0   1.29 MBytes [  4]  37.00-38.00  sec  8.75 MBytes  73.4 Mbits/sec    0   1.25 MBytes [  4]  38.00-39.00  sec  7.50 MBytes  62.9 Mbits/sec    0   1.25 MBytes [  4]  39.00-40.00  sec  10.0 MBytes  83.8 Mbits/sec    0   1.16 MBytes [  4]  40.00-41.00  sec  11.2 MBytes  94.4 Mbits/sec    0   1.37 MBytes [  4]  41.00-42.00  sec  10.0 MBytes  83.9 Mbits/sec    0   1.38 MBytes [  4]  42.00-43.00  sec  7.50 MBytes  63.0 Mbits/sec   79   1.07 MBytes [  4]  43.00-44.00  sec  8.75 MBytes  73.4 Mbits/sec   34    728 KBytes [  4]  44.00-45.00  sec  7.50 MBytes  62.9 Mbits/sec   99   1.38 MBytes [  4]  45.00-46.00  sec  7.50 MBytes  62.9 Mbits/sec  200   1.38 MBytes [  4]  46.00-47.00  sec  8.75 MBytes  73.4 Mbits/sec   62   1.21 MBytes [  4]  47.00-48.00  sec  7.50 MBytes  62.9 Mbits/sec   22   1.26 MBytes [  4]  48.00-49.00  sec  8.75 MBytes  73.5 Mbits/sec    0   1.33 MBytes [  4]  49.00-50.00  sec  8.75 MBytes  73.4 Mbits/sec    5   1.23 MBytes [  4]  50.00-51.00  sec  7.50 MBytes  62.8 Mbits/sec    0   1.25 MBytes [  4]  51.00-52.00  sec  10.0 MBytes  84.0 Mbits/sec    0   1.30 MBytes [  4]  52.00-53.00  sec  7.50 MBytes  62.9 Mbits/sec    0   1.29 MBytes [  4]  53.00-54.00  sec  8.75 MBytes  73.4 Mbits/sec    4   1.26 MBytes [  4]  54.00-55.00  sec  7.50 MBytes  62.9 Mbits/sec    0   1.24 MBytes [  4]  55.00-56.00  sec  8.75 MBytes  73.4 Mbits/sec    0   1.23 MBytes [  4]  56.00-57.00  sec  7.50 MBytes  62.9 Mbits/sec    0   1.19 MBytes [  4]  57.00-58.00  sec  10.0 MBytes  83.9 Mbits/sec    0   1.23 MBytes [  4]  58.00-59.00  sec  7.50 MBytes  62.9 Mbits/sec    0   1.21 MBytes [  4]  59.00-60.00  sec  6.25 MBytes  52.4 Mbits/sec    0   1.24 MBytes - - - - - - - - - - - - - - - - - - - - - - - - - Test Complete. Summary Results: [ ID] Interval           Transfer     Bandwidth       Retr [  4]   0.00-60.00  sec   520 MBytes  72.7 Mbits/sec  1625             sender [  4]   0.00-60.00  sec   514 MBytes  71.8 Mbits/sec                  receiver CPU Utilization: local/sender 1.5% (0.1%u/1.3%s), remote/receiver 3.5% (0.4%u/3.2%s) iperf Done.  
 
also did not tweak kernel settings too much atm - both ends read:
net.core.default_qdisc = fq_codel net.core.netdev_max_backlog = 1024 net.core.rmem_max = 33554432 net.core.wmem_max = 33554432 net.ipv4.tcp_rmem = 4096 87380 33554432 net.ipv4.tcp_wmem = 4096 87380 33554432 net.ipv4.tcp_congestion_control = bbr # RETEST westwood OR cubic net.ipv4.tcp_max_syn_backlog = 1024 net.ipv4.tcp_slow_start_after_idle = 0 net.ipv4.tcp_no_metrics_save = 0 net.ipv4.ip_local_port_range = 9000 65535  
If you want a cheap and low wattage VPN consider H5 boards ( eg nanopi neo2 or orange pi zero plus2 ) that should handle proper TV streaming (15-20Mbit) over ovpn this is your option.
If speed will be most important consider other platforms, I'm currently looking in to the ASRock J4005B-ITX and should do 300Mbit ...

thanks for clarifying Igor, will RTFM next time better ...
Don't worry will try not to bug too much and build from scratch, as long I can use NanoPi NEO2 crypto engine Id be more than happy ;-)