This post analyzes a critical bug in CUBIC, Linux's default TCP and QUIC congestion control algorithm, where the congestion window becomes permanently pinned at its minimum after a congestion collapse event.

Congestion Control

Debugging

QUIC

QUICHE

Making Rust Workers reliable: panic and abort recovery in wasm‑bindgen

Rust Workers addresses panic and abort reliability issues in WebAssembly using exception handling and recovery mechanisms.

Agents Week: network performance update

Cloudflare became the fastest network provider in 60% of the top 1,000 networks by December 2025, up from 40% in September.

Network Performance Update

Architecture•2026-03-23

Launching Cloudflare’s Gen 13 servers: trading cache for cores for 2x edge compute performance

Cloudflare explains how their FL2 Rust-based request handling layer enabled 2x edge compute performance on Gen 13 servers powered by AMD EPYC Turin processors.

Architecture•2026-02-13

Shedding old code with ecdysis: graceful restarts for Rust services at Cloudflare

Cloudflare open-sourced ecdysis, a Rust library enabling zero-downtime graceful process restarts for high-traffic network services.

Architecture•2026-01-27

Building a serverless, post-quantum Matrix homeserver

This post describes a proof-of-concept Matrix homeserver ported to Cloudflare Workers, eliminating traditional operational overhead while adding post-quantum cryptography.

Cloudflare Workers

Durable Objects

Cloudflare Workers KV