Bdtyktl

I have an Ubuntu 18.04 desktop that was new a few years ago, but it is still a very capable machine, with 8 cores (i7-4790 + 16GB + 1TB SSD).

I recently switched to 18.04 and for some reason, my wired Internet connection via Ethernet (1Gbit/s NIC) is only able to pump down 18-20Mbps or so on download. It is able to saturate upload with 100Mbps. I have a 1G connection to my router (connected via two switches to my router, both 1Gbps switches). My ISP connection is symetric 100MBps/100Mbps. Just to check if my switch was the problem, I connected the same cable to my Mac which was able to saturate my ISP connection at 100Mbps.

My lshw -c network output looks like this:

  *-network                 

   description: Ethernet interface

   product: RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller

   vendor: Realtek Semiconductor Co., Ltd.

   physical id: 0

   bus info: pci@0000:03:00.0

   logical name: enp3s0

   version: 0c

   serial: f8:bc:12:93:8e:19

   size: 1Gbit/s

   capacity: 1Gbit/s

   width: 64 bits

   clock: 33MHz

   capabilities: pm msi pciexpress msix vpd bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation

   configuration: autonegotiation=on broadcast=yes driver=r8168 driverversion=8.045.08-NAPI duplex=full ip=192.168.1.40 latency=0 link=yes multicast=yes port=twisted pair speed=1Gbit/s

   resources: irq:30 ioport:d000(size=256) memory:f7200000-f7200fff memory:f2100000-f2103fff

  *-network DISABLED

   description: Wireless interface

   product: QCA9565 / AR9565 Wireless Network Adapter

   vendor: Qualcomm Atheros

   physical id: 0

   bus info: pci@0000:04:00.0

   logical name: wlp4s0

   version: 01

   serial: 90:48:9a:2e:ce:f7

   width: 64 bits

   clock: 33MHz

   capabilities: pm msi pciexpress bus_master cap_list rom ethernet physical wireless

   configuration: broadcast=yes driver=ath9k driverversion=4.15.0-44-generic firmware=N/A latency=0 link=no multicast=yes wireless=IEEE 802.11

   resources: irq:16 memory:f7100000-f717ffff memory:f7180000-f718ffff

  *-network:0

   description: Ethernet interface

   physical id: 1

   logical name: br-763ed3b1d7a9

   serial: 02:42:df:43:a4:1c

   capabilities: ethernet physical

   configuration: broadcast=yes driver=bridge driverversion=2.3 firmware=N/A ip=172.20.0.1 link=no multicast=yes

  *-network:1

   description: Ethernet interface

   physical id: 2

   logical name: br-5ae17914b506

   serial: 02:42:54:9d:cb:e5

   capabilities: ethernet physical

   configuration: broadcast=yes driver=bridge driverversion=2.3 firmware=N/A ip=172.21.0.1 link=no multicast=yes

  *-network:2

   description: Ethernet interface

   physical id: 3

   logical name: docker0

   serial: 02:42:c4:10:1c:63

   capabilities: ethernet physical

   configuration: broadcast=yes driver=bridge driverversion=2.3 firmware=N/A ip=172.17.0.1 link=no multicast=yes

  *-network:3

   description: Ethernet interface

   physical id: 4

   logical name: br-2d05881c601d

   serial: 02:42:c5:00:33:c6

   capabilities: ethernet physical

   configuration: broadcast=yes driver=bridge driverversion=2.3 firmware=N/A ip=172.19.0.1 link=no multicast=yes

  *-network:4

   description: Ethernet interface

   physical id: 5

   logical name: br-6e918bada3df

   serial: 02:42:2c:4b:ab:96

   capabilities: ethernet physical

   configuration: broadcast=yes driver=bridge driverversion=2.3 firmware=N/A ip=172.18.0.1 link=no multicast=yes

FWIW, I also have docker running on this machine, though I fail to see why and how that should matter.

Does anyone know what is going on? I did add r8168-dkms and rebooted, though that seems to have done nothing to the issue.

I'm currently struggling with that same NIC, but in version 06.

My symptoms:

• "ethtool -S enp3s0" shows plenty of rx_errors.


• Download limited to 5Mbits variable.


• Other tools such as ifconfig do not report any rx error.


• I'm stuck with 100Mbits (While I have everything in GBits) - For that is seems your luckier than me.


• If I disable the full duplex (ethtool -s enp3s0 duplex half), this fixes the rx_errors, but not my speed problem. At least I get the 100Mbits.

So, first check if you see errors with ethtool -S enp3s0.

I tried to install the r8168-dkms package/module (then reboot). But it the same behaviour.

Also check:

root@pivert-desktop:~# modinfo r8168

filename:       /lib/modules/4.15.0-45-generic/updates/dkms/r8168.ko

version:        8.045.08-NAPI

In my case, since it takes it from /updates/dkms/, it's using the dkms driver.

root@pivert-desktop:~# lshw -C network   *-network                 

       description: Ethernet interface

       product: RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller

       vendor: Realtek Semiconductor Co., Ltd.

       physical id: 0

       bus info: pci@0000:03:00.0

       logical name: enp3s0

       version: 06

       serial: bc:5f:f4:45:b7:34

       size: 100Mbit/s

       capacity: 1Gbit/s

       width: 64 bits

       clock: 33MHz

       capabilities: pm msi pciexpress msix vpd bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation

       configuration: autonegotiation=off broadcast=yes driver=r8168 driverversion=8.045.08-NAPI duplex=full ip=192.168.232.34 latency=0 link=yes multicast=yes port=twisted pair speed=100Mbit/s

       resources: irq:35 ioport:d000(size=256) memory:d4004000-d4004fff memory:d4000000-d4003fff