Limited Ethernet speed

mibadt · 2014-09-12 14:13:58

Hi,
I've a fully updated Arch-X86_64 desktop connected via Ethernet cable to a 100Mb/Sec router & Internet.
As my actual speed is much lower I've tested (see below) and found the culprit: my NIC is configured as 10Mb/Sec / Half Duplex only (see below) and when I've tried to configure it to 100 Mb, it failed to detect the Link. I've got these results with three different Ethernet cables.

In order to "clear" the router and Ethernet cable, I've connected an Arch_based laptop to the same cable (and router). Using the same infrastructure, the laptop flawless connected at 1000! Mb/Sec Full Duplex! Thus I guess my router and cable should support at least 100 Mb speed.

The laptop NIC reports same values as the desktop ones below, except for speed , duplex and link detection)

Please advise!

-------status of my Desktop NIC------------------

# ethtool enp5s0
Settings for enp5s0:
        Supported ports: [ TP MII ]
        Supported link modes:   10baseT/Half 10baseT/Full 
                                100baseT/Half 100baseT/Full 
                                1000baseT/Half 1000baseT/Full 
        Supported pause frame use: No
        Supports auto-negotiation: Yes
        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
        Speed: 10Mb/s
        Duplex: Half
        Port: MII
        PHYAD: 0
        Transceiver: internal
        Auto-negotiation: on
        Supports Wake-on: pumbg
        Wake-on: g
        Current message level: 0x00000033 (51)
                               drv probe ifdown ifup
        Link detected: no

mibadt · 2014-09-12 14:20:36

Forgot to mention:

My desktop NIC hardware & driver:

06:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 03)
        Subsystem: Gigabyte Technology Co., Ltd Motherboard
        Flags: bus master, fast devsel, latency 0, IRQ 50
        I/O ports at 8e00 [size=256]
        Memory at fddff000 (64-bit, prefetchable) [size=4K]
        Memory at fddf8000 (64-bit, prefetchable) [size=16K]
        [virtual] Expansion ROM at fde00000 [disabled] [size=128K]
        Capabilities: [40] Power Management version 3
        Capabilities: [50] MSI: Enable+ Count=1/1 Maskable- 64bit+
        Capabilities: [70] Express Endpoint, MSI 01
        Capabilities: [ac] MSI-X: Enable- Count=4 Masked-
        Capabilities: [cc] Vital Product Data
        Capabilities: [100] Advanced Error Reporting
        Capabilities: [140] Virtual Channel
        Capabilities: [160] Device Serial Number 03-00-00-00-68-4c-e0-00
        Kernel driver in use: r8169
        Kernel modules: r8169

My newer laptop happens to use the Realtek controller (although rev 07) and same kernel module

Arch Linux

#1 2014-09-12 14:13:58

Limited Ethernet speed

#2 2014-09-12 14:20:36

Re: Limited Ethernet speed

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