Authors: Ripal Nathuji (Georgia Institute of Technology) and Karsten Schwan (Georgia Institute of Technology)
Paper: http://www.sosp2007.org/papers/sosp111-nathuji.pdf
Datacenters need power management. Cooling makes things worse. Indusry deployed ACPI.
How do you maintain power information in virtualization layer?
Lots of platform heterogeneity in a datacenter. Variations in power, performance, managability. Homogenize using VMs. Can restrict physical utilization of a VM ("soft scaling"). Can adhere to virtualization SLAs in the guest OS without being specifically aware of them. Take advantage of feedback loop.
Implementation: VPM events created when guest OS makes a power call. Dom0 can retrieve these events.
Future work: VPM tokens, idle power management (additional VPM C-states), efficient soft-scale consolidations
Q: Any estimate of whether adherence to OS power interface has a cost?
A: Want to look at it. Looking at a lightweight paravirtualization solution.
Q: What about consolidating nodes (i.e., shutting down physical nodes)?
A: Well, we can do this on-the-fly automatically.
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