Re: [Xen-devel] Workings/effectiveness of the xen-acpi-processor driver

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

On Sun, May 06, 2012 at 06:23:41PM +0300, Pasi Kärkkäinen wrote:
> On Thu, Apr 26, 2012 at 01:04:26PM -0400, Konrad Rzeszutek Wilk wrote:
> > > >>
> > > >> This I would take as C3 and C6 really not being used and the frequency 
> > > >> scaling
> > > > 
> > > > To go in deeper modes there is also a need to backport a Xen unstable
> > > > hypercall which will allow the kernel to detect the other states besides
> > > > C0-C2.
> > > > 
> > > > "XEN_SET_PDC query was implemented in c/s 23783:
> > > >     "ACPI: add _PDC input override mechanism".
> > > >     
> > > 
> > > I see. There is a kernel patch about enabling MWAIT that refers to that...
> > 
> > Yeah, I should see about back-porting it in Xen 4.1..
> > 
> 
> Should this patch be backported and merged to xen-4.1-testing.hg for Xen 
> 4.1.3 release ? 

It is a new feature so no. Which does mean that the MWAIT states won't be 
uploaded
to the hypervisor. But the legacy ones (so the ones that are in the ACPI _CST)
are still uploaded. And TurboMode kicks in without the MWAIT states.


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