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

[Jeremy Fitzhardinge <jeremy@xxxxxxxx>]

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
>> 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?

    J

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