How to Measure PPTP Speed on an OpenWrt Router
OpenWrt PPTP speed depends on CPU, encryption, and GRE overhead. Use wired iperf3 tests, CPU checks, and repeatable benchmarks to find your real limit.
Tag: System performance tuning
Linux Process Life Cycle: States, Signals, and Diagnosis
Linux processes cycle through R, S, D, and T states. Learn to read /proc, use strace, and diagnose stuck tasks without guessing or killing blindly.
Profile-bpfcc: Low-Overhead CPU Stack Sampling
Profile-bpfcc samples CPU stacks in-kernel without recompiling, showing exactly where cycles burn in kernel and userspace with minimal overhead.
Linux Syscall Tracing: Find Latency in 3 Steps
Diagnose Linux latency by tracing syscalls with strace, perf trace, or BCC tools. Learn which tool fits production vs development and how to read the results.