ottawan

Yes I figured that out once I examined the data. But ony after it was uploaded. When I ran armbianmonitor though I did not expect it to do automatic upload and my immediate reaction was WTF

That's kinda obvious, as all 3 share the very same on chip ethernet port. But I'm still struggling to understand how come my T4 is running 4.4.192 just fine, but neo4 is experiencing a massive packet loss running 4.4.208 and one of the earlier 4.4.x versions but 5.4.20 and 5.3.x before - all good. So now on that automated testing script topic: is it to be run as root or a regular user? Is it safe to run on a live system? Does it send anything automatically like armbianmonitor does? (To be honest - I was unpleasantly surprized seeing the data collected sent somewhere without review or even asking).

I'll definitely look into it now, seems neo4 is not quite popular out there, I must be one of a few 'lucky' ones :)))

Great observation, thank you Werner! Before the upgrade from Stretch (was not Bionic, sorry, my mistake) I was indeed running kernel v.5.x because back then I also saw some slow performance but blamed it on a new USB enclosure without proper testing, then just upgraded the kernel and that solved the problem. In fact I bet it was the very same thing. Now after switching to 5.4.20 theres still some insignificant packet loss but guess I can live with it.

It's not an 'upgrade' per se, rather a clean install.

But only when the connection is initiated by the remote host. iperf3 -s ----------------------------------------------------------- Server listening on 5201 ----------------------------------------------------------- Accepted connection from nanopcT4, port 51356 [ 5] local nanopiNeo4 port 5201 connected to nanopcT4 port 51358 [ ID] Interval Transfer Bitrate Retr Cwnd [ 5] 0.00-1.00 sec 2.34 MBytes 19.7 Mbits/sec 108 1.41 KBytes [ 5] 1.00-2.00 sec 2.05 MBytes 17.2 Mbits/sec 100 2.83 KBytes [ 5] 2.00-3.00 sec 4.68 MBytes 39.3 Mbits/sec 220 5.66 KBytes [ 5] 3.00-4.00 sec 199 KBytes 1.63 Mbits/sec 24 1.41 KBytes [ 5] 4.00-5.00 sec 3.25 MBytes 27.3 Mbits/sec 179 15.6 KBytes [ 5] 5.00-6.00 sec 4.53 MBytes 38.0 Mbits/sec 217 1.41 KBytes [ 5] 6.00-7.00 sec 1.10 MBytes 9.19 Mbits/sec 56 4.24 KBytes [ 5] 7.00-8.00 sec 860 KBytes 7.04 Mbits/sec 38 2.83 KBytes [ 5] 8.00-9.00 sec 5.75 MBytes 48.3 Mbits/sec 291 1.41 KBytes [ 5] 9.00-10.00 sec 4.00 MBytes 33.6 Mbits/sec 209 1.41 KBytes - - - - - - - - - - - - - - - - - - - - - - - - - [ ID] Interval Transfer Bitrate Retr [ 5] 0.00-10.00 sec 28.7 MBytes 24.1 Mbits/sec 1442 sender ----------------------------------------------------------- Server listening on 5201 ----------------------------------------------------------- iperf3 -c nanopcT4 -R Connecting to host nanopcT4, port 5201 Reverse mode, remote host nanopcT4 is sending [ 5] local nanopiNeo4 port 55042 connected to nanopcT4 port 5201 [ ID] Interval Transfer Bitrate [ 5] 0.00-1.00 sec 108 MBytes 905 Mbits/sec [ 5] 1.00-2.00 sec 112 MBytes 942 Mbits/sec [ 5] 2.00-3.00 sec 112 MBytes 942 Mbits/sec [ 5] 3.00-4.00 sec 112 MBytes 942 Mbits/sec [ 5] 4.00-5.00 sec 112 MBytes 942 Mbits/sec [ 5] 5.00-6.00 sec 112 MBytes 942 Mbits/sec [ 5] 6.00-7.00 sec 112 MBytes 942 Mbits/sec [ 5] 7.00-8.00 sec 112 MBytes 942 Mbits/sec [ 5] 8.00-9.00 sec 112 MBytes 942 Mbits/sec [ 5] 9.00-10.00 sec 112 MBytes 941 Mbits/sec - - - - - - - - - - - - - - - - - - - - - - - - - [ ID] Interval Transfer Bitrate Retr [ 5] 0.00-10.00 sec 1.09 GBytes 940 Mbits/sec 0 sender [ 5] 0.00-10.00 sec 1.09 GBytes 938 Mbits/sec receiver There was also some less significant packet loss and slower performance running Bionic. and asymmetric as well, but in the opposite direction - when neo4 is initiating connection: iperf3 -c nanopcT4 -R Connecting to host nanopcT4, port 5201 Reverse mode, remote host nanopcT4 is sending [ 4] local nanopiNeo4 port 60366 connected to nanopcT4 port 5201 [ ID] Interval Transfer Bandwidth [ 4] 0.00-1.00 sec 73.5 MBytes 617 Mbits/sec [ 4] 1.00-2.00 sec 78.2 MBytes 656 Mbits/sec [ 4] 2.00-3.00 sec 78.2 MBytes 656 Mbits/sec [ 4] 3.00-4.00 sec 78.4 MBytes 658 Mbits/sec [ 4] 4.00-5.00 sec 77.7 MBytes 652 Mbits/sec [ 4] 5.00-6.00 sec 77.6 MBytes 651 Mbits/sec [ 4] 6.00-7.00 sec 77.8 MBytes 653 Mbits/sec [ 4] 7.00-8.00 sec 77.7 MBytes 652 Mbits/sec [ 4] 8.00-9.00 sec 76.8 MBytes 644 Mbits/sec [ 4] 9.00-10.00 sec 79.1 MBytes 663 Mbits/sec - - - - - - - - - - - - - - - - - - - - - - - - - [ ID] Interval Transfer Bandwidth Retr [ 4] 0.00-10.00 sec 778 MBytes 653 Mbits/sec 152 sender [ 4] 0.00-10.00 sec 775 MBytes 650 Mbits/sec receiver iperf Done. iperf3 -s ----------------------------------------------------------- Server listening on 5201 ----------------------------------------------------------- Accepted connection from nanopcT4, port 51336 [ 5] local nanopiNeo4 port 5201 connected to nanopcT4 port 51338 [ ID] Interval Transfer Bandwidth Retr Cwnd [ 5] 0.00-1.00 sec 106 MBytes 889 Mbits/sec 0 404 KBytes [ 5] 1.00-2.00 sec 113 MBytes 946 Mbits/sec 0 404 KBytes [ 5] 2.00-3.00 sec 112 MBytes 936 Mbits/sec 0 404 KBytes [ 5] 3.00-4.00 sec 113 MBytes 947 Mbits/sec 0 445 KBytes [ 5] 4.00-5.00 sec 112 MBytes 943 Mbits/sec 1 328 KBytes [ 5] 5.00-6.00 sec 112 MBytes 940 Mbits/sec 0 369 KBytes [ 5] 6.00-7.00 sec 112 MBytes 939 Mbits/sec 0 392 KBytes [ 5] 7.00-8.00 sec 112 MBytes 942 Mbits/sec 0 428 KBytes [ 5] 8.00-9.00 sec 113 MBytes 945 Mbits/sec 0 428 KBytes [ 5] 9.00-10.00 sec 112 MBytes 941 Mbits/sec 0 443 KBytes [ 5] 10.00-10.02 sec 2.86 MBytes 1.06 Gbits/sec 0 443 KBytes - - - - - - - - - - - - - - - - - - - - - - - - - [ ID] Interval Transfer Bandwidth Retr [ 5] 0.00-10.02 sec 1.09 GBytes 937 Mbits/sec 1 sender [ 5] 0.00-10.02 sec 0.00 Bytes 0.00 bits/sec receiver