This article explores why SSH sends a large number of packets for a single keystroke, specifically highlighting the impact of keystroke timing obfuscation introduced in 2023. The author investigates performance issues in a high-performance game running over SSH and discovers that the added chaff packets significantly increase CPU and bandwidth usage. Solutions for optimizing SSH performance without compromising security are discussed.

This article explores an efficient I/O abstraction using io_uring on Linux and kqueue on FreeBSD/macOS. It discusses how to handle non-blocking I/O with a focus on batching requests and callbacks to improve performance. The author provides a minimal TCP echo server example and suggests a flexible interface for managing I/O across an application.