Mastering TCP: How SACK, Delayed ACK, and RTT Boost Performance Testing

Understanding TCP's Selective Acknowledgment (SACK), Delayed ACK, and Round‑Trip Time (RTT) mechanisms is essential for performance and fault testing, as they improve retransmission efficiency, balance latency and bandwidth, and influence timeout calculations, enabling engineers to design precise test scenarios and optimize network reliability.

Delayed ACKNetwork ProtocolsPerformance Testing

0 likes · 9 min read

Mastering TCP: How SACK, Delayed ACK, and RTT Boost Performance Testing

Ctrip Technology

Nov 1, 2024 · Operations

Ctrip's Weak Network Detection Model: Design, Implementation, and Evaluation

This article details Ctrip's end‑to‑end weak‑network identification model, covering background, metric selection, data collection on iOS and Android, processing pipelines with dynamic weighting, weighted median calculations, success‑rate trends, threshold tuning, and deployment results across multiple platforms.

CRTTWeak Network Detection

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Ctrip's Weak Network Detection Model: Design, Implementation, and Evaluation

Liangxu Linux

Feb 7, 2024 · Fundamentals

Why TCP Congestion Control Adds Unexpected RTTs and How to Diagnose It

The article analyzes how TCP's three‑way handshake, slow‑start, and initial congestion window can introduce extra round‑trip times, causing service latency to far exceed network RTT, and shows practical packet captures, Linux defaults, and mitigation techniques.

LinuxNetwork LatencyRTT

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Why TCP Congestion Control Adds Unexpected RTTs and How to Diagnose It

Open Source Linux

Jun 29, 2020 · Operations

Top 6 Free Tools to Measure Network Latency and Boost Performance

This article explains what network latency is, how it is measured with metrics like RTT and TTFB, discusses the built‑in Ping utility and its limitations, and recommends six free tools that help network administrators monitor and reduce latency effectively.

Network LatencyRTTfree tools

0 likes · 12 min read

Top 6 Free Tools to Measure Network Latency and Boost Performance

Efficient Ops

Nov 2, 2016 · Operations

Mastering CDN DNS: Compatibility, Speed, and Precision Optimization

This article, based on Li Meng’s 2016 Shanghai Global Operations Conference talk, examines CDN DNS deployment and optimization from a developer’s perspective, covering DNS architecture, NS clustering, BIND selection algorithms, RTT-based weighting, error penalties, and practical guidelines for achieving compatible, fast, and efficient DNS solutions.

BINDCDNDNS

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Mastering CDN DNS: Compatibility, Speed, and Precision Optimization

21CTO

Dec 7, 2015 · Mobile Development

How Ctrip Optimized Mobile App Network Performance: Real-World Practices and Lessons

Ctrip's wireless development director shares a comprehensive overview of the app's network architecture, common performance pitfalls, and six concrete optimization techniques that boosted service success rates above 99% and cut latency by up to 200 ms across diverse network conditions.

CtripProtocolsRTT

0 likes · 15 min read

How Ctrip Optimized Mobile App Network Performance: Real-World Practices and Lessons