Apologies for skirting close, but I think power consumption and heat dissipation are pretty big operator costs, and anything we can do to reduce those are beneficial to the bottom line; never mind the environment. More below:
>-----Original Message----- >From: Karl Southern [mailto:k...@theangryangel.co.uk] >Sent: Thursday, May 14, 2009 1:10 AM >To: Tomas L. Byrnes >Cc: na...@merit.edu >Subject: Re: questions about DVFS in saving energy > >Tomas L. Byrnes wrote: >> Basically the CPU scaling on the host makes the guest OS fall apart. >> >Apologies for the general noise (and even more apologies for stepping >outside of the nanog scope), but if it's timing related issues does >/usepmtimer not resolve this issue for the VMs? It certainly does on >other virtualisation solutions. [TLB:] We tried all the solutions we could Google, including /usepmtimer. A potential 50% reduction in power per system (which is what we were measuring in the tests) would be significant. Unfortunately, it was not stable. It appears to be a Win2K3 issue, although Red Hat Enterprise ran at the declock speed all the time, even under heavy loads (it didn't crash and corrupt volumes like Win2K3, however).
