How to use Linux for network bandwidth optimization

How to use Linux for network bandwidth optimization

Optimizing network bandwidth is the key to improving network transmission speed and quality. In Linux systems, there are many methods that can help us optimize network bandwidth. This article will introduce some common methods and attach corresponding code examples.

1. Adjust kernel parameters

Adjusting Linux kernel parameters can improve network performance. The following are some commonly used parameters and sample codes:

a) Modify the TCP window size
The TCP window size determines the speed of sending and receiving data. By increasing the TCP window size, you can speed up network transfers.

Open the terminal and enter the following command:

sudo sysctl -w net.ipv4.tcp_window_scaling=1
sudo sysctl -w net.ipv4.tcp_rmem='4096 87380 4194304'
sudo sysctl -w net.ipv4.tcp_wmem='4096 87380 4194304'

b) Turn on TCP Quick Open
TCP Quick Open can speed up the establishment of TCP connections. Enter the following command:

sudo sysctl -w net.ipv4.tcp_fastopen=3

c) Enable congestion control algorithm
Linux supports a variety of TCP congestion control algorithms. Selecting the appropriate algorithm according to different network environments can improve network throughput.

Enter the following command to view the current congestion control algorithm:

cat /proc/sys/net/ipv4/tcp_congestion_control

Enter the following command to switch to the BBR algorithm:

sudo sysctl -w net.ipv4.tcp_congestion_control=bbr

2. Optimize the network queue

Linux systems use queues to process network packets. By adjusting the size and processing of queues, network latency and packet loss can be reduced. The following is some sample code:

Open a terminal and enter the following command to view the current queue length:

sudo sysctl -q net.core.netdev_max_backlog

Enter the following command to increase the queue length to the maximum:

sudo sysctl -w net.core.netdev_max_backlog=100000

3. Use network acceleration tools

Network acceleration tools can increase network bandwidth by optimizing transmission protocols and compressing data. The following are two commonly used network acceleration tools:

a) Wondershaper
Wondershaper is a Linux network bandwidth management tool that can limit bandwidth and optimize network performance. The following is the sample code:

sudo apt-get install wondershaper
sudo wondershaper eth0 1000 100

The above code will limit the download speed of the eth0 interface to 1000 Kbps and the upload speed to 100 Kbps.

b) TC (Traffic Control)
TC is a network traffic control tool that comes with the Linux system. It can optimize network performance by setting different filters and rules. Here is the sample code:

sudo tc qdisc add dev eth0 root tbf rate 100mbit burst 32kbit latency 400ms

The above code will set the bandwidth of the eth0 interface to 100 Mbps, the burst rate to 32 Kbps, and the latency to 400 ms.

Summary:

In Linux systems, by adjusting kernel parameters, optimizing network queues and using network acceleration tools, we can effectively improve network bandwidth performance. The above methods only provide some commonly used sample codes. Depending on the actual situation, you may need to make appropriate adjustments and configurations according to your own needs. I wish you success in using Linux for network bandwidth optimization!

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