ZNSwap: un-Block your Swap
summary
ZNSwap is a swap subsystem for Zoned Namespace SSDs that implements a space-efficient host-side GC and OS–device co‑ordination to avoid unnecessary internal copies. It runs on Ubuntu 20.04 with Linux 5.12 and 512 GB RAM, compares a ZNS device against an identical block SSD, and reports concrete gains: 10× lower 99th-percentile latency and up to 5× higher memcached throughput under realistic workloads while reducing write amplification and keeping GC CPU overhead modest.
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chapters (11)
- 0:00Start
- 0:27Motivation: Why is Swap Important?
- 1:35Motivation: Swap on Traditional SSDs?
- 2:55Background: SSDs
- 8:45ZNS: Tighter SSD-APP coupling
- 10:14ZNSwap: new swap subsystem for ZNS
- 10:48ZNSwap: Design Overview
- 12:44ZNSwap Design: ZNGC
- 15:32ZNSwap Evaluation: vm-scalability
- 17:17ZNSwap Evaluation: memcached
- 17:59ZNSwap Evaluation: Cgroup Isolation
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