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

["Jan Beulich" <JBeulich@xxxxxxxxxx>]

>>> 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
> 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.

Jan

> (XEN) 'c' pressed -> printing ACPI Cx structures
> (XEN) ==cpu0==
> (XEN) active state:
> C-1
> 
> 
> What does the state 'C-1' mean?
> 
> Used hardware:
> Board: Intel DQ67SW
> CPU: Intel i5 2400
> 
> Is this whole CPU-package PC6 state supposed to work in xen/dom0?
> 
> Should I file a bug report for this problem?
> 
> 
> Thanks,
> Martin




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