Improving Key-Value Cache Performance With Heterogeneous Memory Tiering: A Case Study of Compute-Express-Link-Based Memory Expansion. - Kyungsoo Lee; Sohyun Kim; Joohee Lee; Donguk Moon; Rakie Kim; Honggyu Kim; Hyeongtak Ji; Yunjeong Mun; Youngpyo Joo (IEEE Micro, 2025)