Linux Network Performance Optimization: Tips for Optimizing Network Latency
Optimizing network performance in Linux involves using eBPF and XDP for efficient packet processing, adjusting MTU and TCP settings, and utilizing tools like irqbalance and ethtool to enhance throughput and reduce latency.
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Optimizing network performance in Linux is crucial for enhancing throughput and reducing latency without incurring hardware costs. Key strategies include utilizing advanced technologies like eBPF and XDP, which facilitate efficient packet processing directly on the network interface card (NIC). Adjusting the Maximum Transmission Unit (MTU) can minimize fragmentation, while tuning parameters such as transmit queue length, TCP congestion control, and buffer sizes can significantly improve data flow. Implementing TCP Fast Open can expedite connection establishment, and adjusting TCP timeout settings can help manage resources effectively. Tools like irqbalance and ethtool can optimize CPU usage and network interface settings, respectively. Additionally, busy polling can enhance performance by reducing latency. These optimizations are essential for maintaining high performance in modern networked environments, ensuring that applications run smoothly and efficiently.
- Optimizing Linux network performance can be achieved without hardware upgrades.
- Technologies like eBPF and XDP enhance packet processing efficiency.
- Adjusting MTU and TCP settings can significantly improve throughput and reduce latency.
- Tools like irqbalance and ethtool are useful for managing network performance.
- Implementing TCP Fast Open can reduce connection establishment time.
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1 commentsI am not going into details on all of this as it would at best turn into a massive blog. For most people the defaults should suffice and for others that need to improve latency they should learn not only what each setting does but how they play together which also involves learning a great deal about real world implementations of TCP/IP. For those that love to tune things, myself included, tune one thing at a time and give it a month or two to soak whilst you test communication to every possible thing. Don't just use tools like iperf, nuttcp and other benchmarking tools. They will deceive even the smartest people as they do not mimic the real internet. Behaviors change dramatically as latency, network appliances, load characteristics, packet loss, packet reordering and other things get in the way. If going down the path of tweaking things, first get very comfortable with tcpdump and Wireshark.
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