斐讯N1在CoreELEC下的网口速度问题

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一、问题产生

斐讯N1硬件配置有千兆网口。但是使用中发现千兆交换机只运行在百兆速度上。

检查设备端,发现在CoreELEC 9.0.2中默认按照百兆的速度在跑。

        ethtool eth0
        Settings for eth0:
        Supported ports: [ TP MII ]
        Supported link modes:   10baseT/Half 10baseT/Full
                                100baseT/Half 100baseT/Full
                                1000baseT/Half 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/Half 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
        Link partner advertised pause frame use: Symmetric Receive-only
        Link partner advertised auto-negotiation: Yes
        Link partner advertised FEC modes: Not reported
        Speed: 100Mb/s
        Duplex: Full
        Port: MII
        PHYAD: 0
        Transceiver: external
        Auto-negotiation: on
        Supports Wake-on: ug
        Wake-on: d
        Current message level: 0x0000003d (61)
                               drv link timer ifdown ifup
        Link detected: yes

Speed:100Mb/s

二、变量控制

斐讯N1使用了一颗RTL8211F芯片,网口8线全通,硬件支援千兆没问题。

分别测试了 Cat.5e / Cat.6 (超五类,六类线),确定此问题不是由于线缆问题导致(鉴于Link partner advertised link modes 显示只支持到100Mbps)

网络速度遵循短板原理,如果硬件上都达到千兆所需,那就是软体问题:自动协商(advertised auto-negotiation)功能导致其只工作在100Mbps模式上。

三、问题解决

关闭自动协商,强制指定网卡工作在1000Mbps,全双工模式下

执行指令

ethtool -s eth0 speed 1000 duplex full autoneg off

大约30秒之后执行成功,使用ethtool检查其状态

ethtool eth0
Settings for eth0:
        Supported ports: [ TP MII ]
        Supported link modes:   10baseT/Half 10baseT/Full
                                100baseT/Half 100baseT/Full
                                1000baseT/Half 1000baseT/Full
        Supported pause frame use: Symmetric Receive-only
        Supports auto-negotiation: Yes
        Supported FEC modes: Not reported
        Advertised link modes:  1000baseT/Full
        Advertised pause frame use: Symmetric Receive-only
        Advertised auto-negotiation: No
        Advertised FEC modes: Not reported
        Speed: 1000Mb/s
        Duplex: Full
        Port: MII
        PHYAD: 0
        Transceiver: external
        Auto-negotiation: off
        Supports Wake-on: ug
        Wake-on: d
        Current message level: 0x0000003d (61)
                               drv link timer ifdown ifup
        Link detected: yes

Speed:1000Mb/s

成功

不过由于设备自身IO短板,实际速度大约24MBytes/s左右,那就是另一回事了。

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