Networking

eBPF (extended Berkeley Packet Filter) lets you attach tiny sandboxed programs to kernel events: syscalls, network packets, scheduler decisions, and filesystem calls. You collect detailed performance data in real time. No kernel source changes, no custom modules, no service restarts. With bpftrace one-liners and the BCC toolkit, you can measure per-process disk latency, trace TCP connections, profile CPU hotspots, and find memory leaks on production Linux. Overhead is usually under 2%.

Can your consumer router do WireGuard VPN at 800 Mbps, isolate IoT devices into separate VLANs, and kill bufferbloat with a single queue management setting? Stock firmware almost certainly cannot. OpenWrt can.

OpenWrt is a full Linux distribution that replaces the limited manufacturer firmware on compatible routers. The router ends up behaving more like a managed switch and enterprise firewall than the box your ISP sent you. The current stable release is OpenWrt 25.12.2 (March 2026), which introduced the apk package manager (replacing opkg) and now supports over 2,200 devices. Flashing typically takes five minutes and is reversible if you keep a backup.

Every SSH connection needs the right host, port, user, and sometimes a specific key, and there is no good place to write all that down outside of ~/.ssh/config. That file stays the most underused tool in any developer’s home directory. Without it you retype ssh deploy@10.0.4.17 -p 2222 -J bastion.example.com every session, forget which IP belongs to which server two weeks later, and end up with a shell history full of nearly identical commands.

The Short Answer

When Zigbee devices keep dropping, the culprit is almost always the mesh topology, not the sensors. Add mains-powered routers every 10 to 15 meters. Move the coordinator away from the WiFi router and any USB 3.0 port. Switch to Zigbee channel 15, 20, or 25 to dodge WiFi. Use the network map in Zigbee2MQTT or ZHA to spot weak links. Roughly 90% of complaints trace back to three things: too few routers, a coordinator in an RF hot zone, and a Zigbee channel that clashes with WiFi.

To wire up loose Python microservices, use NATS JetStream as the message bus with the nats-py client. JetStream gives you durable consumers, full stream replay, and exactly-once delivery through message dedup and double-ack. It does this in sub-millisecond time, with one small server binary. No Kafka brokers, no ZooKeeper.

This guide covers JetStream setup, pub/sub with durable consumers, a three-service order pipeline, and the steps to harden it for production.

Thunderbolt 5 doubles the pipe to 80 Gbps in both directions (120 Gbps with Bandwidth Boost for displays). It is USB4 v2 compliant and tunnels PCIe Gen 4 x4. For Linux users, that means real gains for eGPU rigs, multi-display docks, and fast NVMe drive bays. Kernel 6.10+ ships basic Thunderbolt 5 support through the thunderbolt driver. Full feature work depends on your distro, firmware, and hardware. The upgrade pays off only when you need more speed than Thunderbolt 4’s 40 Gbps can give.