[SOLVED] CuBox-i4-pro | LE8.0.2 | Not getting gigabit speeds

r0nnybums · September 15, 2017 at 5:17 PM

Hi All,

After noting that some music I was playing was skipping I've noticed that my CuBox i4-pro is only running at 100Mbps on the network. I believe the fault lies on the CuBox itself; here's the troubleshooting I've done to establish that:

Other devices plugged in to different ports on my router get gigabit speeds.
The CuBox, when plugged in to these other ports, still only gets 100Mbps speeds.
The CuBox, with a different 1m Cat5e cable, still only gets 100Mbps speeds.
The Cubox, with this different cable, plugged into another gigabit switch, still only gets 100Mbps speeds.
My laptop, with this different cable, plugged into both the router and the gigabit switch, gets full gigabit speeds.

To confirm I should be getting gigabit, I checked the manufacturers page (SolidRun | Simple Robust Embedded Computing Solutions

Code

Ethernet:    10/100/1000 Mbps (*)

(*) Note that due to internal i.MX6 buses the 1000Mbps interface speed is limited to 470Mbps.

I've started looking at the CuBox and it seems to report that 100Mbps is the maximum:

Code

CuBox:~ # ethtool eth0
Settings for eth0:
        Supported ports: [ TP MII ]
        Supported link modes:   10baseT/Half 10baseT/Full
                                100baseT/Half 100baseT/Full
        Supported pause frame use: No
        Supports auto-negotiation: Yes
        Advertised link modes:  10baseT/Half 10baseT/Full
                                100baseT/Half 100baseT/Full
        Advertised pause frame use: No
        Advertised auto-negotiation: Yes
        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
        Speed: 100Mb/s
        Duplex: Full
        Port: MII
        PHYAD: 4
        Transceiver: external
        Auto-negotiation: on
        Supports Wake-on: g
        Wake-on: g
        Link detected: yes

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I tried setting the speed manually with:

Code

ethtool -s eth0 speed 1000 duplex full autoneg off

but it just drops the connection and brings it back up at 100Mbps.

Any ideas?!

**vpeter** · September 15, 2017 at 5:47 PM

It is set 100mbit intentionally imx6/linux: limit ethernet speed to 100mbits which works reliable ... by vpeter4 · Pull Request #1618 · LibreELEC/LibreELEC.tv · GitHub because it is more stable.

Because of 100mbit you should not see any difference when playing music or video. There must be something else.

If you really want to have gigabit speed then you need to uncomment line

Code

#enable_giga_arg=fec.disable_giga=0

in file /storage/uEnv.txt

Code

mount -o remount,rw /flash
sed "s|#enable_giga_arg=fec.disable_giga=0|enable_giga_arg=fec.disable_giga=0|g" /flash/uEnv.txt
mount -o remount,ro /flash

or using nano or vi editor.

r0nnybums · September 15, 2017 at 5:50 PM

Much appreciated yet again vpeter - agreed that it is probably something else that is causing the stuttering. Will test with music on a USB drive as it may be the NAS I'm streaming from that is causing the issue.

Marked as solved.