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Practical Linux/Bash guide to squeeze double‑digit gains from AI servers by tuning, not rewriting models: measure a baseline, lock CPU/GPU clocks, align CPU/memory/GPU via NUMA, set THP/hugepages wisely, and optimize NVMe, filesystems, and networking. Provides apt/dnf/zypper commands, validation checks, NCCL/net tweaks, and troubleshooting—demonstrating ~17% faster steps and ~22% better P99, plus an optional automation script.