Why we use the Linux kernel's TCP stack

What this post added

This post delves into Cloudflare's strategic decision to utilize the Linux kernel's TCP stack, explaining the benefits of hardware independence, time-sharing, and running multiple network applications. It highlights the trade-offs of userspace networking and kernel bypass, particularly the loss of concurrent application support. The post details Cloudflare's use of 'partial kernel bypass' for DDoS mitigation, offloading iptables to a userspace process to avoid IRQ storms. It also emphasizes the value of the Linux TCP stack's features, debugging tools, and ecosystem over custom solutions.