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problems with AR8151 onboard LAN (lemmy.zip)
submitted 3 weeks ago by to c/selfhosted@lemmy.world
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Hello everyone.

I'm getting a hard time with Qualcomm Atheros AR8151 onboard LAN with Debian. It usually drops to 100Mb/s and freezes the network altogether

Settings for enp1s0: Supported ports: [ TP ] Supported link modes: 10baseT/Half 10baseT/Full 100baseT/Half 100baseT/Full 1000baseT/Full Supported pause frame use: No Supports auto-negotiation: Yes Supported FEC modes: Not reported Advertised link modes: Not reported Advertised pause frame use: No Advertised auto-negotiation: Yes Advertised FEC modes: Not reported Speed: 100Mb/s Duplex: Full Auto-negotiation: on Port: Twisted Pair PHYAD: 0 Transceiver: internal MDI-X: Unknown Supports Wake-on: pg Wake-on: d Current message level: 0x0000003f (63) drv probe link timer ifdown ifup Link detected: yes [ 3.004591] atl1c 0000:01:00.0 enp1s0: renamed from eth0

[ 37.754972] atl1c 0000:01:00.0: atl1c: enp1s0 NIC Link is Up<100 Mbps Full Duplex> [ 45.071291] atl1c 0000:01:00.0: atl1c: enp1s0 NIC Link is Up<100 Mbps Full Duplex> [ 45.799689] atl1c 0000:01:00.0: atl1c: enp1s0 NIC Link is Up<100 Mbps Full Duplex>

any tips of what can be done around here? I'm using kernel 6.12.111+deb13-amd64

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[–] 13 points 3 weeks ago (1 child)

Dumb question, but have you ruled out the cable being bad or corrosion in the socket? Dropping to 100 is usually something bad with the cable.

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  • [–] [S] 5 points 3 weeks ago

    no tdumb at all. I tried other cables, but I never got a fully cleanup on the socket itself. As it was an auction purchase, I guess some drops of deoxit and a good scrub won't make things any worse. Thanks!

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    • [–] 2 points 3 weeks ago

    If it's on a card, ditch it and replace it with a better one. If not, and you've got a spare slot, buy a new card.

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    [–] 3 points 3 weeks ago

    Does it persist if you change the cable, the device on the far side, the OS? What's in the log when it drops?

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    [–] 2 points 3 weeks ago (2 children)

    What are you plugged into?

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  • [–] [S] 2 points 3 weeks ago (1 child)

    I admit that at this very moment its running on a generic switch. I tried other cables, but no change.

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  • [–] 1 point 3 weeks ago* (last edited 3 weeks ago)

    That may be your problem. Do you have multiple 10G cards? Try doing a direct link between two machines. Auto MDIX will take care of the electrical connection but you will need to set static IPs in order to run a iperf3 test

    Additionally, make sure you are using cat6/6a cables

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    • [–] 1 point 3 weeks ago

    Seen similar behaviour on Fedora and MXLinux. It was a kernel issue. Upgrading kernel solved it for me.

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