Re: [Xen-devel] [PATCH v5 8/9] x86/intel_pstate: support the use of intel_pstate in pmstat.c

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

On 26/10/2015 18:37,  Jan Beulich wrote:
> >>> On 26.10.15 at 11:19, <wei.w.wang@xxxxxxxxx> wrote:
> > On 26/10/2015 17:54,  Jan Beulich wrote:
> >> That wasn't the question; I rather inquired what "meaning at the same time"
> >> both fields have.
> >
> > turbo_enable: indicates if turbo is enabled or not.
> > turbo_pct: shows the capability of turbo in percentage. For example if
> > the CPU has the following operating frequency range:
> > From [Min] to [Max]: 1.2GH, 1.3GHZ,1.4GHZ,...,2.3GHZ, so 1.2--->2.3,
> > length = 12 Turbo frequency: 3.7GHZ, so 1.2---->3.7, length = 26 Then
> > turbo_pct = (26 - 12) / 26 = 54%, that is turbo_pct = 54.
> 
> So what meaning does e.g. "turbo_enabled = 1" plus "turbo_pct = 0"
> have? Or "turbo_enabled = 0" plus "turbo_pct > 0"?

" turbo_pct = 54" is the property of the CPU, just like MAX=3.7GHZ. It should 
be something engraved on stone, not changeable. So, I think it's not a good 
idea to put them together.

Best,
Wei

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