Getting 50 GB/S Back Out of the ANE
Summary
Getting 50 GB/s Back Out of the ANE analyzes a hardware-level throughput drop on Apple's M3 Neural Engine when kernel DMA transfers are aligned to 1 MiB chunks. It documents measurements, hypotheses about DRAM contention and RTL wraparound, a proposed prefetch lookahead issue, and a software workaround of splitting transfers to restore near-nominal bandwidth, with observed gains on AI model workloads like Llama 3.2 1B and Qwen3-8B.