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

["Jan Beulich" <jbeulich@xxxxxxxx>]

>>> "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.

Jan


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