/blog/networking/ Recent content in networking on david@connol.ly Hugo en-IE Copyright © 2026, David Connolly. Fri, 01 May 2026 00:00:00 +0000 /2026/05/udpspeeder.html Fri, 01 May 2026 00:00:00 +0000 /2026/05/udpspeeder.html <p>A fork of UDPspeeder, an FEC tunnel that masks loss on lossy, high-latency links by sending redundant packets so the receiver can rebuild what gets dropped. The exercise here is to push the per-packet cost towards the theoretical floor: the unavoidable data movement plus the irreducible Reed-Solomon arithmetic, with as little else in between as possible. The hot paths are rewritten with SIMD (x86_64 AVX2/SSE4.2, ARM64 NEON, MIPS, PowerPC e500v2, RISC-V), selected at runtime, with a scalar fallback. On Linux it uses io_uring on receive and GSO batching on send.</p>