Improving Scalability of Xen

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" summary

Xen is extended to handle thousands of guests: a patch replaces select with poll/epoll to remove the 124‑FD console limit, a three‑level event API prototype lifts event channels from 4K toward 256K, and a 3,000‑VM run on an 8‑socket, 80‑core machine proves the changes work (instances run for days and deliver events). Measured bottlenecks are slow domain creation (seconds to hours at scale), Linux bridge 1,024 interface limit, PV backend buffer starvation, IO slowness and CPU contention requiring reserved physical CPUs.

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" chapters (21)

1. 0:00Introduction
2. 2:02Open Source
3. 2:37Architecture
4. 5:06Atrium Guest
5. 5:46Current scalability status
6. 8:11Simple calculation
7. 10:30Backend Domains
8. 13:04Scalability Issues
9. 16:11To Set Limit
10. 17:51Event Channel Limit
11. 18:58Default ABI
12. 21:09Designers Follow ABI
13. 22:36Memory Footprint
14. 23:33Pros and Cons
15. 24:02People API
16. 27:19Link View Design
17. 28:04Link View Pros Cons
18. 28:44Community Decision
19. 36:06Mini OSP
20. 38:34Hydramonster
21. 43:20Observations