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RE: [Xen-users] Status of Xen-Powermanagement-Support

To: "Hannes Petschauer" <hapet@xxxxxx>, xen-users@xxxxxxxxxxxxxxxxxxx
Subject: RE: [Xen-users] Status of Xen-Powermanagement-Support
From: "Petersson, Mats" <Mats.Petersson@xxxxxxx>
Date: Fri, 15 Sep 2006 14:06:08 +0200
Delivery-date: Fri, 15 Sep 2006 05:13:10 -0700
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Thread-topic: [Xen-users] Status of Xen-Powermanagement-Support
> -----Original Message-----
> From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx 
> [mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of 
> Hannes Petschauer
> Sent: 15 September 2006 13:02
> To: xen-users@xxxxxxxxxxxxxxxxxxx
> Subject: [Xen-users] Status of Xen-Powermanagement-Support
> Hi!
> What is the current status of support for PowerNow! and Speedstep?
> As I remember there were rumors, that those techniques were just 
> supported for dom0, meaning that all the guests would run 
> slow if dom0 
> idles.
> Is there already a solution for this implemented (in the 
> unstable-tree), 
> so that guests do also influence power-state?
> If so, does it also work with dualcore-cpus or is it better to stick 
> with singl-core for now, if one wants to keep Powermanagement-capable?

I was talking to Keir about this at the Xen Summit last week, and the
conclusion was that it's still not done - the code is in Xen to support
writing the MSR's, but the code to understand the overall CPU-load has
to be written. Looking at Xentop and it's interfaces and combining that
with some existing code for deciding CPU speed should be a workable

> Thanks!
> Hannes
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