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The offload gate (M < 32 -> CPU) was compile-time only. Reading the env var (default 32 unchanged) gives a clean NPU on/off toggle: GGML_ROCKET_MIN_BATCH=999999 forces CPU-only for benchmarking without rmmod or a CPU-only build. Used for the 2026-07-18 ampere NPU-vs-CPU gemma prefill benchmark. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01EWpfhDgYNA21tETDP9ueBE