How to use Linux for network performance tuning

How to use Linux for network performance tuning

Network performance is a very important indicator in computer networks, which is directly related to the user's network experience. In Linux systems, we can improve the transmission speed and stability of the network through some simple network performance tuning. This article will introduce common Linux network performance tuning methods and provide code examples.

1. MTU adjustment

MTU is the abbreviation of maximum transmission unit in network transmission, which represents the maximum packet size of a network transmission. By default, the MTU size of Linux systems is 1500 bytes, but in some cases, this may not be large enough, resulting in inefficient network transmission.

By adjusting the MTU size, we can improve network transmission efficiency. Here is a sample code for adjusting the MTU size of network interface eth0 to 9000 bytes:

sudo ifconfig eth0 mtu 9000

2. TCP connection tuning

TCP is the most commonly used network transport One of the protocols, in Linux systems, we can improve network performance by adjusting TCP connection parameters. The following are some commonly used TCP connection tuning parameters and their sample codes:

• Adjust TCP window size

sudo sysctl -w net.ipv4.tcp_window_scaling=1
sudo sysctl -w net.core.rmem_max=8388608
sudo sysctl -w net.core.wmem_max=8388608
sudo sysctl -w net.core.rmem_default=65535
sudo sysctl -w net.core.wmem_default=65535

• Enable fast retransmission and fast recovery

sudo sysctl -w net.ipv4.tcp_sack=1
sudo sysctl -w net.ipv4.tcp_fack=1
sudo sysctl -w net.ipv4.tcp_congestion_control=cubic

• Adjust TCP connection timeout

sudo sysctl -w net.ipv4.tcp_keepalive_time=120

3. IP routing tuning

IP routing is very important in network communication As part of this, by adjusting the IP routing table, we can improve network transmission efficiency. The following are some commonly used IP routing tuning parameters and their sample codes:

• Turn off IP forwarding

sudo sysctl -w net.ipv4.ip_forward=0

• Enable source address verification

sudo sysctl -w net.ipv4.conf.all.rp_filter=1

• Enable IP route caching

sudo sysctl -w net.ipv4.route.flush=1

4. System resource tuning

In addition to the above network performance tuning methods, we can also use Adjust system resources to improve network performance. The following are some commonly used system resource tuning parameters and their sample codes:

• Adjust file descriptor limits

sudo ulimit -n 65535

• Adjust kernel parameters

sudo sysctl -w net.core.netdev_max_backlog=30000
sudo sysctl -w net.ipv4.tcp_max_syn_backlog=8192
sudo sysctl -w net.core.somaxconn=4096

Through the above network performance tuning methods, we can greatly improve the network performance of the Linux system and improve the network transmission speed and stability. Of course, specific tuning methods and parameters need to be carried out according to the actual situation, and different scenarios may have different optimization solutions.

Summary

This article introduces how to use Linux for network performance tuning and provides corresponding code examples. By adjusting the MTU size, TCP connection parameters, IP routing parameters, and system resources, we can improve the network performance of the Linux system and improve network transmission speed and stability. At the same time, it needs to be tuned according to specific conditions to obtain the best network performance results.

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