Why build an SFU from scratch when solutions like LiveKit already exist? After running into performance bottlenecks, platform limitations, and unresolved upstream issues, the Mezon team decided to take full ownership of its real-time media infrastructure. This article explores the architecture behind mezon-sfu — a custom SFU built in C on top of io_uring — and the engineering decisions that enable lower latency, lock-free packet forwarding, efficient congestion control, multi-codec support, and optimizations tailored specifically for Mezon’s communication platform.

First impressions happen in milliseconds. This article breaks down how to measure true Cold Start performance using user-centric video frame analysis and reveals how Mezon stacks up against global giants like Telegram, WhatsApp, Slack, Discord, and Zalo on Android and iOS.

🚀 MEZON CAMPUS STUDIO - KHÔNG CHỈ HỌC, MÀ LÀ "BUILD"

Thực chiến cùng 𝐌𝐞𝐳𝐨𝐧 | 𝐋𝐞𝐚𝐫𝐧𝐢𝐧𝐠 𝐛𝐲 𝐃𝐨𝐢𝐧𝐠 “Đi thực tập nhưng chưa có cơ hội làm sản phẩm thật?” “CV chỉ có project ở trường nhưng vẫn thiếu điểm nhấn?” “Muốn build product thực tế nhưng chưa có cơ hội?” Rất nhiều sinh viên IT đang mắc kẹt trong vòng lặp: học lý thuyết → làm bài tập → nộp đồ án…nhưng vẫn thiếu trải nghiệm thực chiến. 𝐌𝐞𝐳𝐨𝐧 𝐂𝐚𝐦𝐩𝐮𝐬 𝐒𝐭𝐮𝐝𝐢𝐨 ra đời để thay đổi điều đó.

When we set out to build the next generation of our socket gateway, we didn't just want it to work - we wanted it to be unbreakable . To hit 1 Million Concurrent Users (CCU) on a single cluster, standard high-level languages weren't enough. We went "to the metal" with C and a modern asynchronous architecture.

At Mezon, we’ve always been obsessed with performance. For a long time, our stack (Nginx + Unix Sockets + Golang (fasthttp)) - served us well. But as our traffic scaled and latency requirements tightened, we realized that even the most optimized HTTP/1.1 or H2 stacks carry a "protocol tax" we were no longer willing to pay.