# performance

How to tune RHEL 9 performance using tuned profiles, sysctl parameters, CPU governors, NUMA topology, and memory settings — for database servers, web workloads, and latency-sensitive applications.

Fix Grafana dashboards that hang or take minutes to load by optimizing queries, reducing panel count, and tuning datasource settings.

Resolve Nginx 'Too many open files' errors by increasing worker_rlimit_nofile, system ulimits, and kernel file descriptor limits.

Tune Apache performance by choosing the right MPM, configuring KeepAlive correctly, and enabling mod_cache for significant throughput gains.

The sysctl knobs that actually improve Linux network throughput, latency, and connection handling — with benchmarks and safe production values.

Diagnose Linux performance bottlenecks with top, htop, vmstat, iostat, sar, iotop, and strace — a systematic approach to finding and fixing issues.

Set up Nginx as a reverse proxy with SSL termination, response caching, rate limiting, and load balancing for high-traffic applications.

Use Prometheus recording rules to pre-compute expensive queries, speed up dashboards, and make SLO calculations reliable at scale.