Authors: Xiaoxin Chen (VMWare), Tal Garfinkel (VMWare), E. Christopher Lewis (VMWare), Pratap Subrahmanyam (VMWare), Carl A. Waldspurger (VMWare), Dan Boneh (Stanford), Jeffrey Dwoskin (Princeton), Dan R. K. Ports (MIT)
Questions:
Q: Cloaking needs to be atomic? How?
A: Has to be atomic w/ respect to OS. No real fallout for concurrent systems.
Q: Why is MARSHALL mini-benchmark worse than PASSTHRU?
A:
Q: Could you reverse it and use it in the OS to protect against malicious VM?
A: Huh. Maybe.
Q: What's your threat model?
A: Don't worry about I/O (things like SSL protect network).
Q: Why is mmap read performance worse than write?
A: Write has to touch disk anyway, so minimal additional overhead. Read needs an extra page fault.
Showing posts with label virtualization. Show all posts
Showing posts with label virtualization. Show all posts
Monday, March 3, 2008
Tuesday, October 16, 2007
VirtualPower: Coordinated Power Management in Virtualized Enterprise Systems
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.
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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