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

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Mon, May 07, 2012 at 01:33:06PM -0400, Konrad Rzeszutek Wilk wrote:
> 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.
> 

Ah, thanks for clearing that up.

-- Pasi


_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxx
http://lists.xen.org/xen-devel