  PCIe devices, such as SSDs and GPUs, are pivotal in modern data centers, and
their value is set to grow amidst the emergence of AI and large models.
However, these devices face onboard DRAM shortage issue due to internal space
limitation, preventing accommodation of sufficient DRAM modules alongside flash
or GPU processing chips. Current solutions either curb device-internal memory
usage or supplement slower non-DRAM mediums, prove inadequate or
performance-compromising. This paper introduces the Linked Memory Buffer (LMB),
a scalable solution utilizing the CXL memory expander to tackle device onboard
memory deficiencies. The low-latency of CXL enables LMB to utilize emerging
DRAM memory expander to efficiently supplement device onboard DRAM with minimal
impact on performance.
