Re: [Xen-devel] [PATCH 0/9] Porting the intel_pstate driver to Xen

["Wang, Wei W" <wei.w.wang@xxxxxxxxx>]

On 28/04/2015 21:29, Jan Beulich wrote
>>>> "Wang, Wei W" <wei.w.wang@xxxxxxxxx> 04/28/15 3:24 PM >>>
> >On 28/04/2015 21:14, Jan Beulich wrote
> >>  >On 25/04/2015 00:15, Konrad Rzeszutek Wilk wrote
> >> >> How will this affect AMD processors which can use the cpufreq?
> >> >> Would the ondemand feature go away?
> >> >
> >> >No, this won't affect them. When the "intel_pstate=disable" is added
> >> >to the  booting parameter list, the old cpufreq driver will be used,
> >> >and everything,  including xenpm, will work in the old style.
> >>
> >> That wouldn't suffice. On AMD (and older Intel) platforms it
> >> shouldn't be necessary to specifiy the option to retain current
> functionality.
> >
> >No problem, I will change it with "intel_pstate=enable" to enable the
> >intel_pstate driver. Then others will not be bothered.
> 
> For new code this might be a good idea anyway, but that wasn't my point.
> Instead, even with "intel_pstate=enable" on an old Intel (or AMD) system
> (regardless of doing so being pointless) there shouldn't be any behavioral
> difference.

Without " intel_pstate=enable" added, the old acpi-cpufreq driver will be 
loaded, so shouldn't be a problem.

Best,
Wei

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