Re: [Xen-devel] XEN increases idle power consumption by 25%

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Wed, Aug 24, 2011 at 12:33:01PM -0700, Jeremy Fitzhardinge wrote:
> On 08/24/2011 06:29 AM, Jan Beulich wrote:
> >>>> On 24.08.11 at 14:03, Martin Meier <martin4meier@xxxxxxxxxxxxxx> wrote:
> >> Hi,
> >>
> >> I'm seeing a change in AC idle power consumption from ~23W to ~29W
> >> when changing form 3.1-rc2 to 3.1-rc2 on top of xen-4.2-unstable  with no

Um, from the same kernel to the same kernel?

> >> domUs running.
> >>
> >> It seems that the CPU never gets into the low power idle state for the 
> >> whole
> >> CPU-package 'PC6'
> >> and the Vcore voltage never gets below +1.06 V (It get down to 0.7V w/o
> >> xen).
> > This has been discussed recently; see e.g. the thread starting at
> > http://lists.xensource.com/archives/html/xen-devel/2011-08/msg00511.html.
> 
> Also, upstream Linux doesn't have the patches to pass the power state
> stuff through to Xen, which I guess it part of it?

And you can test the xen-cpu-idle patches in #testing if you are up for
seeing if that is the cause of your power consumption issues.

git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen.git #testing

specifically.

> 
>     J
> 
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