Max Inden

Max Inden, software engineer at Mozilla working on Firefox's QUIC and HTTP/3 networking stack. Writing on networking, distributed systems, and the open Internet.

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Systems & Performance 1 Software Engineering 1

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Fast UDP I/O for Firefox in Rust

2025367 points108 comments Software Engineering details

Motivation Around 20% of Firefox’s HTTP traffic today uses HTTP/3, which runs over QUIC, which in turn runs over UDP. This translates to substantial UDP I/O activity. Firefox uses NSPR for most of its network I/O. When it comes to UDP I/O, NSPR only offers a limited set of dated APIs, most relevant here PR_SendTo and…