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Reviving In-Storage Hardware Compression on ZNS SSDs through Host-SSD Collaboration (HPCA'25)

This repository contains the source code of our paper, including:

  • FEMU that implements CCZNS
  • CCZNS-aware Linux kernel
  • CCZNS-aware RocksDB and ZenFS

Notes

FEMU is augmented with computational support to emulate hardware compression and the new I/O processing architecture is introduced in Sec V-A. Notably, our modified FEMU necessitates more CPU cores (e.g., 32 in our evaluation, see Sec V-A) and higher memory in the server. The reason for requiring higher memory is that, to ensure the slow CPU-emulated decompression does not block the fast read I/O, FEMU actually stores the before-compressed data (which is typically larger) in the reserved server memory so that subsequent reads can directly fetch the data without decompression.