poor network performance / send only

[usual user]

15 hours ago, aleksandriusz said:

Can't confirm, still the same thing.

You made me curious, so I rebooted for the first time after my previous report to activate my current versions.
I' m now at kernel 7.0.0-0.rc1.15.fc45.aarch64 and U-Boot 2026.07-rc1 (May 22 2026 - 00:00:00 +0000).
No regressions can be observed and it works as fast as before.

[ferro]

Hi,

 

I can confirm that the issue is present in Armbian v26.5.1 with current kernel versions 6.18.x, and that it is resolved in the edge kernels 6.19.x and 7.1.x.

 

Armbian v26.5.1 - current kernel 6.18.x - NOT OK (many retrans and ~368 Mb/sec):

 

root@odroidtest:~# grep -a --null-data U-Boot /dev/mtd0ro

U-Boot SPL 2026.01_armbian-2026.01-S127a-Pb401-H8652-Vab81-Bd0d2-R448a (May 20 2026 - 22:28:40 +0000)

root@odroidtest:~# uname -a
Linux odroidtest 6.18.35-current-rockchip64 #2 SMP PREEMPT Tue Jun  9 10:28:53 UTC 2026 aarch64 GNU/Linux

root@odroidtest:~# iperf3 -c 192.168.0.1
Connecting to host 192.168.0.1, port 5201
[  5] local 192.168.0.15 port 42940 connected to 192.168.0.1 port 5201
[ ID] Interval           Transfer     Bitrate         Retr  Cwnd
[  5]   0.00-1.00   sec  43.0 MBytes   360 Mbits/sec  199   26.9 KBytes       
[  5]   1.00-2.00   sec  44.9 MBytes   376 Mbits/sec  172   26.9 KBytes       
[  5]   2.00-3.00   sec  41.8 MBytes   350 Mbits/sec  188   39.6 KBytes       
[  5]   3.00-4.00   sec  45.1 MBytes   379 Mbits/sec  178   33.9 KBytes       
[  5]   4.00-5.00   sec  41.9 MBytes   351 Mbits/sec  185   17.0 KBytes       
[  5]   5.00-6.00   sec  46.5 MBytes   390 Mbits/sec  168   35.4 KBytes       
[  5]   6.00-7.00   sec  42.8 MBytes   359 Mbits/sec  170   24.0 KBytes       
[  5]   7.00-8.00   sec  47.0 MBytes   394 Mbits/sec  164   31.1 KBytes       
[  5]   8.00-9.00   sec  41.0 MBytes   344 Mbits/sec  178   18.4 KBytes       
[  5]   9.00-10.00  sec  44.8 MBytes   375 Mbits/sec  167   15.6 KBytes       
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bitrate         Retr
[  5]   0.00-10.00  sec   439 MBytes   368 Mbits/sec  1769            sender
[  5]   0.00-10.00  sec   438 MBytes   368 Mbits/sec                  receiver

iperf Done.

Armbian v26.5.1 - edge kernel 6.19 - OK
 

root@odroidtest:~# grep -a --null-data U-Boot /dev/mtd0ro

U-Boot SPL 2026.01_armbian-2026.01-S127a-Pb401-H8652-Vab81-Bd0d2-R448a (May 20 2026 - 22:28:40 +0000)

root@odroidtest:~# uname -a
Linux odroidtest 6.19.0-edge-rockchip64 #1 SMP PREEMPT Sun Feb  8 21:03:27 UTC 2026 aarch64 GNU/Linux

root@odroidtest:~# iperf3 -c 192.168.0.1
Connecting to host 192.168.0.1, port 5201
[  5] local 192.168.0.15 port 35634 connected to 192.168.0.1 port 5201
[ ID] Interval           Transfer     Bitrate         Retr  Cwnd
[  5]   0.00-1.00   sec   113 MBytes   950 Mbits/sec    0   1.81 MBytes       
[  5]   1.00-2.00   sec   111 MBytes   933 Mbits/sec    0   1.81 MBytes       
[  5]   2.00-3.00   sec   112 MBytes   944 Mbits/sec    0   1.81 MBytes       
[  5]   3.00-4.00   sec   113 MBytes   947 Mbits/sec    0   1.81 MBytes       
[  5]   4.00-5.00   sec   112 MBytes   941 Mbits/sec    0   1.81 MBytes       
[  5]   5.00-6.00   sec   111 MBytes   933 Mbits/sec    0   1.81 MBytes       
[  5]   6.00-7.00   sec   113 MBytes   948 Mbits/sec    0   1.81 MBytes       
[  5]   7.00-8.00   sec   111 MBytes   934 Mbits/sec    1    929 KBytes       
[  5]   8.00-9.00   sec   113 MBytes   948 Mbits/sec    0    929 KBytes       
[  5]   9.00-10.00  sec   113 MBytes   944 Mbits/sec    0    929 KBytes       
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bitrate         Retr
[  5]   0.00-10.00  sec  1.10 GBytes   942 Mbits/sec    1            sender
[  5]   0.00-10.00  sec  1.09 GBytes   939 Mbits/sec                  receiver

iperf Done.

Armbian v26.5.1 - edge kernel 7.1 - OK
 

root@odroidtest:~# grep -a --null-data U-Boot /dev/mtd0ro

U-Boot SPL 2026.01_armbian-2026.01-S127a-Pb401-H8652-Vab81-Bd0d2-R448a (May 20 2026 - 22:28:40 +0000)

root@odroidtest:~# uname -a
Linux odroidtest 7.1.0-edge-rockchip64 #1 SMP PREEMPT Sun Jun 14 14:58:38 UTC 2026 aarch64 GNU/Linux

root@odroidtest:~# iperf3 -c 192.168.0.1
Connecting to host 192.168.0.1, port 5201
[  5] local 192.168.0.15 port 37256 connected to 192.168.0.1 port 5201
[ ID] Interval           Transfer     Bitrate         Retr  Cwnd
[  5]   0.00-1.00   sec   114 MBytes   958 Mbits/sec    0   1.72 MBytes       
[  5]   1.00-2.00   sec   111 MBytes   933 Mbits/sec    0   1.72 MBytes       
[  5]   2.00-3.00   sec   113 MBytes   948 Mbits/sec    0   1.72 MBytes       
[  5]   3.00-4.00   sec   112 MBytes   944 Mbits/sec    0   1.72 MBytes       
[  5]   4.00-5.00   sec   112 MBytes   936 Mbits/sec    0   1.72 MBytes       
[  5]   5.00-6.00   sec   113 MBytes   947 Mbits/sec    0   1.72 MBytes       
[  5]   6.00-7.00   sec   112 MBytes   935 Mbits/sec    0   1.72 MBytes       
[  5]   7.00-8.00   sec   113 MBytes   945 Mbits/sec    0   1.72 MBytes       
[  5]   8.00-9.00   sec   112 MBytes   943 Mbits/sec    0   2.19 MBytes       
[  5]   9.00-10.00  sec   112 MBytes   937 Mbits/sec    0   2.19 MBytes       
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bitrate         Retr
[  5]   0.00-10.00  sec  1.10 GBytes   943 Mbits/sec    0            sender
[  5]   0.00-10.00  sec  1.10 GBytes   941 Mbits/sec                  receiver

iperf Done.