[SOLVED] GMKTec G3 plus (Intel N150) connects at 100Mbps

C

cosmos

Renowned Member
Apr 1, 2013
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Got this mini PC, which comes with an intel 2.5Gbps LAN NIC. After noting slow downloads to it, I've found that the interface is locked at 100Mbps, Any idea why?
Code: 
# ethtool enp3s0
Settings for enp3s0:
        Supported ports: [ TP ]
        Supported link modes:   10baseT/Half 10baseT/Full
                                100baseT/Half 100baseT/Full
                                1000baseT/Full
                                2500baseT/Full
        Supported pause frame use: Symmetric
        Supports auto-negotiation: Yes
        Supported FEC modes: Not reported
        Advertised link modes:  10baseT/Half 10baseT/Full
                                100baseT/Half 100baseT/Full
                                1000baseT/Full
                                2500baseT/Full
        Advertised pause frame use: Symmetric
        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: off (auto)
        Supports Wake-on: pumbg
        Wake-on: g
        Current message level: 0x00000007 (7)
                               drv probe link
        Link detected: yes

My NAS on the same cable connects at 1Gbps just fine. Switch is a managed TP-Link TL-SG108E.
 
I have the same box, connected to a Unifi switch, and the speed is fine for me:


Code: 
root@apu:~# ethtool enp3s0
Settings for enp3s0:
        Supported ports: [ TP ]
        Supported link modes:   10baseT/Half 10baseT/Full
                                100baseT/Half 100baseT/Full
                                1000baseT/Full
                                2500baseT/Full
        Supported pause frame use: Symmetric
        Supports auto-negotiation: Yes
        Supported FEC modes: Not reported
        Advertised link modes:  10baseT/Half 10baseT/Full
                                100baseT/Half 100baseT/Full
                                1000baseT/Full
                                2500baseT/Full
        Advertised pause frame use: Symmetric
        Advertised auto-negotiation: Yes
        Advertised FEC modes: Not reported
        Speed: 1000Mb/s
        Duplex: Full
        Auto-negotiation: on
        Port: Twisted Pair
        PHYAD: 0
        Transceiver: internal
        MDI-X: off (auto)
        Supports Wake-on: pumbg
        Wake-on: g
        Current message level: 0x00000007 (7)
                               drv probe link
        Link detected: yes

Code: 
CPU(s) 4 x Intel(R) N150 (1 Socket)
Kernel Version Linux 6.8.12-11-pve (2025-05-22T09:39Z)
Boot Mode EFI (Secure Boot)
Manager Version pve-manager/8.4.1/2a5fa54a8503f96d

It's an Intel i226V

Code: 
03:00.0 Ethernet controller [0200]: Intel Corporation Ethernet Controller I226-V [8086:125c] (rev 04)
        Subsystem: Intel Corporation Ethernet Controller I226-V [8086:0000]
        Flags: bus master, fast devsel, latency 0, IRQ 18, IOMMU group 14
        Memory at 80400000 (32-bit, non-prefetchable) [size=1M]
        Memory at 80500000 (32-bit, non-prefetchable) [size=16K]
        Capabilities: [40] Power Management version 3
        Capabilities: [50] MSI: Enable- Count=1/1 Maskable+ 64bit+
        Capabilities: [70] MSI-X: Enable+ Count=5 Masked-
        Capabilities: [a0] Express Endpoint, MSI 00
        Capabilities: [100] Advanced Error Reporting
        Capabilities: [140] Device Serial Number e0-51-d8-ff-ff-1b-1c-1c
        Capabilities: [1c0] Latency Tolerance Reporting
        Capabilities: [1f0] Precision Time Measurement
        Capabilities: [1e0] L1 PM Substates
        Kernel driver in use: igc
        Kernel modules: igc

Code: 
driver: igc
version: 6.8.12-11-pve
firmware-version: 2022:889d
expansion-rom-version:
bus-info: 0000:03:00.0
supports-statistics: yes
supports-test: yes
supports-eeprom-access: yes
supports-register-dump: yes
supports-priv-flags: yes
 
Last edited:
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Impact said:
Can you share some information about the NIC as explained here?
If it's the I225-V there have been issues with it.
Click to expand...
That's crazy, made a reboot and it's at 1Gbps now...

Just in case, I'm attaching the needed output (and marking the thread as solved):
Code: 
# lspci -vnnk | awk '/Ethernet/{print $0}' RS=
03:00.0 Ethernet controller [0200]: Intel Corporation Ethernet Controller I226-V [8086:125c] (rev 04)
        Subsystem: Intel Corporation Ethernet Controller I226-V [8086:0000]
        Flags: bus master, fast devsel, latency 0, IRQ 18, IOMMU group 13
        Memory at 80400000 (32-bit, non-prefetchable) [size=1M]
        Memory at 80500000 (32-bit, non-prefetchable) [size=16K]
        Capabilities: [40] Power Management version 3
        Capabilities: [50] MSI: Enable- Count=1/1 Maskable+ 64bit+
        Capabilities: [70] MSI-X: Enable+ Count=5 Masked-
        Capabilities: [a0] Express Endpoint, MSI 00
        Capabilities: [100] Advanced Error Reporting
        Capabilities: [140] Device Serial Number xx-xx-xx-xx-xx-xx
        Capabilities: [1c0] Latency Tolerance Reporting
        Capabilities: [1f0] Precision Time Measurement
        Capabilities: [1e0] L1 PM Substates
        Kernel driver in use: igc
        Kernel modules: igc


# ethtool -i enp3s0
driver: igc
version: 6.8.12-11-pve
firmware-version: 2022:889d
expansion-rom-version:
bus-info: 0000:03:00.0
supports-statistics: yes
supports-test: yes
supports-eeprom-access: yes
supports-register-dump: yes
supports-priv-flags: yes
The only difference I see to @Taomyn 's output is that the card is in a different IOMMU group.
 
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