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• 01:04, 21 November 2025 PC talk contribs created page Io uring Adventures: Rust Servers That Love Syscalls (Created page with "500px We thought our Rust file server was fast. Written with Tokio, leveraging async/await, serving static assets at 45,000 requests per second on modest hardware. The code was clean, the architecture was sound, and the CPU usage sat at a reasonable 60%. We’d reached what felt like the natural limit of network I/O performance. Then we profiled with perf and discovered something startling: 42% of our CPU time was spent in the kernel, no...")