UFO: The Ultimate QoS-Aware Core Management for Virtualized and Oversubscribed Public...
Talkat 21st USENIX Symposium on Networked Systems Design and Implementation (NSDI '24) · 2024-04-16..04-18
summary
UFO is a feedback controller that coordinates host and guest cores, monitors per-VM scheduling frequency every second, predicts when extra pCPUs are needed and enforces core pinning to meet tail-latency SLOs. It implements vCPU-pCPU coordination and inner-VM core isolation, reduces double-scheduling and interrupt interference, and in experiments saves up to 50% of physical cores (22% on average) versus prior core managers. It reacts within 1s to load drops but can take multiple 1s steps (≈6s) to absorb large bursts.
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chapters (10)
- 0:00UFO introduction and motivation
- 2:27Public cloud resource challenges
- 3:10Three-level coordination approach
- 5:40Host-guest latency coordination
- 7:23VM and emulator stress groups
- 9:09UFO architecture and control
- 10:34Resource efficiency evaluation
- 12:20Dynamic load handling in UFO
- 13:44UFO performance decomposition
- 14:49Conclusion and future work