Challenges and Research Directions for LLM Inference Hardware

In this technical report, authors Xiaoyu Ma and David Patterson identify a growing economic and technical crisis in Large Language Model (LLM) inference. They argue that current hardware, which is primarily optimized for training, is inefficient for real-time decoding because it is severely restricted by memory bandwidth and high interconnect latency. To bridge the gap between academic research and industry needs, the authors propose four specific hardware innovations: High Bandwidth Flash (HBF) for increased capacity, Processing-Near-Memory (PNM), 3D memory-logic stacking, and low-latency interconnects. These directions aim to improve the total cost of ownership and energy efficiency as models evolve toward longer contexts and reasoning capabilities. The paper concludes that shifting the focus from raw compute power to sophisticated memory and networking architectures is essential for sustainable AI deployment