Archlinux ARM on Odroid-N2+ very slow internet connection

[john_spam]

Please help solve the issue—connection speed is 10 Kb instead of the available 1000 Mb. The connection is unstable and drops after 10-15 seconds.

dmesg | grep -i eth0
[ 9.459483] meson6-dwmac ff3f0000.ethernet eth0: fail to init PTP.
[ 9.460580] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready
[ 13.546967] meson6-dwmac ff3f0000.ethernet eth0: Link is Up - 1Gbps/Full - flow control rx/tx
[ 13.550034] IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready

ip -s link show eth0
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP mode DEFAULT group default qlen 1000
link/ether 00:1e:06:43:c7:68 brd ff:ff:ff:ff:ff:ff
RX: bytes packets errors dropped missed mcast
1197308 5118 0 350 0 0
TX: bytes packets errors dropped carrier collsns
142762 1203 0 0 0 0

[john_spam]

ethtool -S eth0 | grep -i "error\|drop\|fifo\|missed"
mmc_tx_underflow_error: 0
mmc_tx_carrier_error: 0
mmc_rx_crc_error: 1807
mmc_rx_align_error: 0
mmc_rx_run_error: 0
mmc_rx_jabber_error: 0
mmc_rx_length_error: 0
mmc_rx_fifo_overflow: 0
mmc_rx_watchdog_error: 0
tx_payload_error: 0
tx_ip_header_error: 0
overflow_error: 0
ipc_csum_error: 0
rx_missed_cntr: 0
fatal_bus_error_irq: 0
phy_eee_wakeup_error_n: 0
timestamp_dropped: 0
mtl_tx_status_fifo_full: 0
mtl_tx_fifo_not_empty: 0
mmtl_fifo_ctrl: 0
mtl_tx_fifo_read_ctrl_write: 0
mtl_tx_fifo_read_ctrl_wait: 0
mtl_tx_fifo_read_ctrl_read: 0
mtl_tx_fifo_read_ctrl_idle: 0
mtl_rx_fifo_fill_level_full: 0
mtl_rx_fifo_fill_above_thresh: 0
mtl_rx_fifo_fill_below_thresh: 0
mtl_rx_fifo_fill_level_empty: 0
mtl_rx_fifo_read_ctrl_flush: 0
mtl_rx_fifo_read_ctrl_read_data: 0
mtl_rx_fifo_read_ctrl_status: 0
mtl_rx_fifo_read_ctrl_idle: 0
mtl_rx_fifo_ctrl_active: 0
mac_rx_frame_ctrl_fifo: 0