Low Internet speed

English Network/Internet
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1

My wired internet connection speed is 1000Mbps and the TP-Link Archer C6 v2 router allows up to 900Mbps. Windows 10 gets up to 900Mbps. But openSUSE Tumbleweed delivers a maximum of 550-570Mbps. The network controller is Marvell Technology Group Ltd. 88E8056 PCI-E Gigabit Ethernet Controller.

sudo ethtool enp3s0
Settings for enp3s0:
        Supported ports: [ TP ]
        Supported link modes:   10baseT/Half 10baseT/Full
                                100baseT/Half 100baseT/Full
                                1000baseT/Half 1000baseT/Full
        Supported pause frame use: No
        Supports auto-negotiation: Yes
        Supported FEC modes: Not reported
        Advertised link modes:  10baseT/Half 10baseT/Full
                                100baseT/Half 100baseT/Full
                                1000baseT/Half 1000baseT/Full
        Advertised pause frame use: No
        Advertised auto-negotiation: No
        Advertised FEC modes: Not reported
        Speed: 1000Mb/s
        Duplex: Full
        Auto-negotiation: off
        Port: Twisted Pair
        PHYAD: 0
        Transceiver: internal
        MDI-X: Unknown
        Supports Wake-on: pg
        Wake-on: d
        Current message level: 0x000000ff (255)
                               drv probe link timer ifdown ifup rx_err tx_err
        Link detected: yes
2

@AxelR8 Make sure the router and your system has Auto-negotiation set on the ports and see if there is a difference.

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