Realtek PCIe GBE NIC Driver

Applicable for RTL8111/8168/8411 PCIe GBE NIC.
Using this driver for the devices above will resolve the problem that uploading speed is limited around 4MB/s per TCP connection under TCP-BBR.

Install dependences
```
apt update
apt install build-essential libelf-dev linux-headers-$(uname -r)
```
*if you are using Ubuntu PPA kernel, please download header packages by yourself:
http://kernel.ubuntu.com/~kernel-ppa/mainline/
Download the driver and install

This repo contains a copy of the official driver (8.046.00):
```
git clone https://github.com/airium/Realtek-PCIe-GBE-NIC-Driver.git
cd Realtek-PCIe-GBE-NIC-Driver/r8168-8.046.00
sh autorun.sh
# this script will break the network temporarily
# on Ubuntu 16/18, it will automatically restore in ~1 minute
# on Debian 8/9, you might have to reboot manually
```
You can also check newer drivers from Realtek's official site:
https://www.realtek.com/en/component/zoo/advanced-search/472?Itemid=276
Note: it seems Realtek is changing their urls frequently, you probably have to search for new ones.

Check if the driver of the network interface in which you are interested has been updated

for i in $(ls /sys/class/net); do
    echo $i '====================='
    ethtool -i $i
done

Example of success

enp1s0 =====================
driver: r8168
version: 8.046.00-NAPI
firmware-version:
expansion-rom-version:
bus-info: 0000:01:00.0
supports-statistics: yes
supports-test: no
supports-eeprom-access: no
supports-register-dump: yes
supports-priv-flags: no

Note: you need to re-install the driver on changing kernel.

Reference:

https://www.unixblogger.com/how-to-get-your-realtek-rtl8111rtl8168-working-updated-guide/

laiyongqin/Realtek-PCIe-GBE-NIC-Driver

Realtek PCIe GBE NIC Driver