aleksandriusz

No difference on an installation with `linux-u-boot-odroidm1-edge/sid,now 26.8.0-trunk.12` and `linux-image-edge-rockchip64/sid` (7.0.8-edge-rockchip64 ), 1000 Mbps link is still heavily degraded, especially on packets leaving my gateway router. Could anyone subscribed to this thread confirm that's still the case? Thanks! 1000 Mbps link: root@odroidm1 ~# ethtool -s eth0 speed 1000 duplex full autoneg on root@odroidm1 ~ [1]# iperf3 -c 10.0.3.3 Connecting to host 10.0.3.3, port 5201 [ 5] local 10.0.3.2 port 51448 connected to 10.0.3.3 port 5201 [ ID] Interval Transfer Bitrate Retr Cwnd [ 5] 0.00-1.00 sec 1.00 MBytes 8.38 Mbits/sec 12 22.8 KBytes [ 5] 1.00-2.00 sec 384 KBytes 3.15 Mbits/sec 2 11.4 KBytes [ 5] 2.00-3.00 sec 0.00 Bytes 0.00 bits/sec 1 10.4 KBytes [ 5] 3.00-4.00 sec 256 KBytes 2.10 Mbits/sec 0 19.9 KBytes 100 Mbps link: root@odroidm1 ~# ethtool -s eth0 speed 100 duplex full autoneg off root@odroidm1 ~# iperf3 -c 10.0.3.3 Connecting to host 10.0.3.3, port 5201 [ 5] local 10.0.3.2 port 38436 connected to 10.0.3.3 port 5201 [ ID] Interval Transfer Bitrate Retr Cwnd [ 5] 0.00-1.00 sec 6.00 MBytes 50.3 Mbits/sec 0 2.38 MBytes [ 5] 1.00-2.00 sec 8.38 MBytes 70.3 Mbits/sec 0 7.87 MBytes [ 5] 2.00-3.00 sec 9.25 MBytes 77.6 Mbits/sec 0 7.87 MBytes # grep -a --null-data U-Boot /dev/mtd0ro U-Boot SPL 2026.01_armbian-2026.01-S127a-P2477-H8652-Vab81-Bd0d2-R448a (May 15 2026 - 06:45:08 +0000)

Just a quick update for those who are following this thread, looks like there was a pull request for U-Boot with this fix (2026-02-02): https://github.com/armbian/build/pull/9333 Waiting for the U-Boot update i guess (i'm using `linux-u-boot-odroidm1-edge/sid` currently).

Hi, looks like the issue still persists, but I have a temporary solution in case if your upload speed drops *way* beyond yours (2 Mbps for me). You can force-use a 100 Mbps link speed. `iperf3` results below. Literally 50x speed increase in my case! I've performed these benchmarks connecting to my VPS via wireguard: ``` $ cat /dev/mtd/by-name/U-Boot | strings | grep -B1 "u-boot,version"` U-Boot: 2026.01_armbian-2026.01-S127a-Pc2e6-H706e-Vab81-B2eb2-R448a ``` Linux 6.18.10-current-rockchip64 Standard operation (1000 Mbps): ```root@odroidm1 ~# ethtool -s eth0 speed 1000 duplex full root@odroidm1 ~# iperf3 -c 10.0.3.1 Connecting to host 10.0.3.1, port 5201 [ 5] local 10.0.3.2 port 42538 connected to 10.0.3.1 port 5201 [ ID] Interval Transfer Bitrate Retr Cwnd [ 5] 0.00-1.00 sec 384 KBytes 3.14 Mbits/sec 5 14.7 KBytes [ 5] 1.00-2.00 sec 384 KBytes 3.15 Mbits/sec 5 6.68 KBytes [ 5] 2.00-3.00 sec 384 KBytes 3.14 Mbits/sec 2 13.4 KBytes [ 5] 3.00-4.00 sec 256 KBytes 2.10 Mbits/sec 6 9.35 KBytes [ 5] 4.00-4.43 sec 128 KBytes 2.42 Mbits/sec 0 22.7 KBytes ``` Dirty fix, link capped at 100 Mbps at most: ``` root@odroidm1 ~# ethtool -s eth0 speed 100 duplex full root@odroidm1 ~# iperf3 -c 10.0.3.1 Connecting to host 10.0.3.1, port 5201 [ 5] local 10.0.3.2 port 42354 connected to 10.0.3.1 port 5201 [ ID] Interval Transfer Bitrate Retr Cwnd [ 5] 0.00-1.00 sec 11.4 MBytes 95.3 Mbits/sec 0 1.03 MBytes [ 5] 1.00-2.00 sec 10.5 MBytes 88.1 Mbits/sec 0 1.03 MBytes [ 5] 2.00-3.00 sec 11.4 MBytes 95.4 Mbits/sec 0 1.10 MBytes [ 5] 3.00-4.00 sec 10.2 MBytes 86.0 Mbits/sec 0 1.10 MBytes [ 5] 4.00-4.48 sec 5.00 MBytes 87.4 Mbits/sec 0 1.10 MBytes ``` So.. yeah. While using Wireshark I also saw *a lot* of TCP retransmissions too, which usually don't happen that at 100 Mbps link in my configuration.