How to Run Memtest86 for Reliable RAM Diagnostics
Bare-metal memory testing with MemTest86 catches faults that in-OS tools miss. Learn why multiple passes matter and how to read failing addresses.
Tag: System performance optimization
When to Build Your Own Server (and When Not To)
Server builds need ECC memory, RAID, and your ability to debug at 2am. Learn what workloads justify building versus renting or buying pre-built.
Monitor DNS Traffic with eBPF
eBPF for DNS monitoring gives me precise visibility into queries and responses without touching daemon code. I attach small programs at kernel tracepoints, parse headers, and capture latency where packets flow. I write steps you can run now: build with libbpf, attach at socket tracepoints, and export structured events to a UI like NetObserv. The […]
OpenWrt Packet Steering on Multi-Core Routers: When It Helps
Packet steering spreads network load across CPU cores on multi-core routers, but only helps if one core is bottlenecked. Check /proc/interrupts first to decide.
Kernel Overhead: What It Is and How eBPF Cuts It
Kernel overhead drains CPU cycles through privilege transitions, context switching, and memory isolation. Learn what causes it and how to measure it yourself.
eBPF Load Balancer: XDP Forwarding at Line Rate
Run `bpftool feature` before you write any code, because an eBPF load balancer only earns its place when you actually need to forward or drop packets before.
XDP Offload vs Native: Which Mode Runs on Your Hardware
XDP offload runs programs on the NIC processor, not your CPU. Learn which modes actually use hardware and how to verify your real attach mode.