High-Performance Edge Tunneling Architecture: Kernel Bypass, XDP, and BBR Tuning
In latency-sensitive systems such as trading gateways, telemetry pipelines and edge relay meshes, the general-purpose Linux network stack can become the bottleneck. Per-packet work in the kernel adds jitter, and oversized queues on the path add delay. A tunnel relay that forwards millions of packets per second feels both problems. This guide covers three techniques that attack different parts of the problem: Kernel-bypass data planes with AMD Solarflare Onload and the Data Plane Development Kit (DPDK). eBPF/XDP (eXpress Data Path) for filtering and redirecting packets at the driver level, before the kernel allocates socket buffers. BBR congestion control for paths with variable bandwidth and deep buffers, such as cellular and residential Wi-Fi uplinks. One caveat applies throughout. Only kernel bypass and XDP help with per-packet CPU cost. BBR addresses queueing delay on the network path, which is a different problem. Pick the technique that matches the bottleneck you have m...
