questions about DVFS in saving energy

William Pitcock nenolod at
Wed May 13 17:19:40 CDT 2009

Xen handles the AMD HE CPUs just fine here. What sort of breakage are you experiencing?

------Original Message------
From: Tomas L. Byrnes
To: Kai Chen
To: nanog at
Subject: RE: questions about DVFS in saving energy
Sent: May 13, 2009 2:31 PM

-----Original Message-----
From: Kai Chen [mailto:kch670 at] 
Sent: Wednesday, May 13, 2009 12:25 PM
To: nanog at
Subject: questions about DVFS in saving energy

Hi, could anyone here have some idea of the following questions about
Dynamic Voltage/Frequency Scaling techniques used for energy efficiency,
or please give a pointer that I can trace,
1) how many servers in the market support this technique?
2) how many voltages/frequencies can the servers support?
3) What's the transition time and cost (power) between these


My experience with the AMD HE CPUs has been that the scaling breaks
Win2K3, and any virtualized environments.

William Pitcock
SystemInPlace - Simple Hosting Solutions

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