[Roby77]

gigabit is ok

c:\>iperf3 -c 192.168.2.237
Connecting to host 192.168.2.237, port 5201
[  4] local 192.168.2.38 port 1400 connected to 192.168.2.237 port 5201
[ ID] Interval           Transfer     Bandwidth
[  4]   0.00-1.00   sec   112 MBytes   935 Mbits/sec
[  4]   1.00-2.00   sec   112 MBytes   939 Mbits/sec
[  4]   2.00-3.00   sec   112 MBytes   939 Mbits/sec
[  4]   3.00-4.00   sec   113 MBytes   948 Mbits/sec
[  4]   4.00-5.00   sec   112 MBytes   937 Mbits/sec
[  4]   5.00-6.00   sec   112 MBytes   941 Mbits/sec
[  4]   6.00-7.00   sec   112 MBytes   937 Mbits/sec
[  4]   7.00-8.00   sec   112 MBytes   940 Mbits/sec
[  4]   8.00-9.00   sec   112 MBytes   939 Mbits/sec
[  4]   9.00-10.00  sec   113 MBytes   945 Mbits/sec
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bandwidth
[  4]   0.00-10.00  sec  1.09 GBytes   940 Mbits/sec                  sender
[  4]   0.00-10.00  sec  1.09 GBytes   940 Mbits/sec                  receiver


LibreELEC:~ # uname -a
Linux LibreELEC 5.4.13 #1 SMP Wed Jan 22 21:05:59 GMT 2020 x86_64 GNU/Linux

Supported ports: [ TP MII ]
        Supported link modes:   10baseT/Half 10baseT/Full
                                100baseT/Half 100baseT/Full
                                1000baseT/Full
        Supported pause frame use: Symmetric Receive-only
        Supports auto-negotiation: Yes
        Supported FEC modes: Not reported
        Advertised link modes:  10baseT/Half 10baseT/Full
                                100baseT/Half 100baseT/Full
                                1000baseT/Full
        Advertised pause frame use: Symmetric Receive-only
        Advertised auto-negotiation: Yes
        Advertised FEC modes: Not reported
        Link partner advertised link modes:  10baseT/Half 10baseT/Full
                                             100baseT/Half 100baseT/Full
                                             1000baseT/Half 1000baseT/Full
        Link partner advertised pause frame use: Symmetric
        Link partner advertised auto-negotiation: Yes
        Link partner advertised FEC modes: Not reported
        Speed: 1000Mb/s
        Duplex: Full
        Port: MII
        PHYAD: 0
        Transceiver: internal
        Auto-negotiation: on
        Supports Wake-on: pumbg
        Wake-on: g
        Current message level: 0x00000033 (51)
                               drv probe ifdown ifup
        Link detected: yes