On Tue, 24 Jul 2007, Randy Fishel wrote:
>
> On Tue, 24 Jul 2007, Andrei Dorofeev wrote:
>
> > I think there could be two approaches:
> >
> > 1) Intel puts all of their processors in three categories: single socket,
> > dual socket (DP) and MP. So it should be possible to tell roughly
> > what kind of system we have just by looking at the part number.
> >
> > 2) ACPI FADT table has a special field called "Preferred_PM_Profile"
> > which gets set by the OEMs to convey preferred power management
> > profile to OSPM. See page 114 in ACPI3.0a spec for the complete
> > list.
>
> There is code in powerd to look for "Preferred_PM_Profile", however,
> it is unreliable as this field is misused or misunderstood (there are
> instances of "Desktop" for rack mounted servers, though it could also
> be that Windows is requiring this return value, which wouldn't
> surprise me as we have also identified Windowisms in BIOS's).
>
> So in theory, we could auto enable CPU power management based on
> "Preferred_PM_Profile" (we are going to auto enable suspend and resume
> based on manufacturer, model, and Preferred_PM_Profile).
I should restate that there "will be" code in powerd, as it is
currently part of suspend/resume (but it is due soon, and the
preferred profile code could go back earlier if it is desired).
>
> ---- Randy
>
>
> >
> > Hope this helps,
> > - Andrei
> >
> > On 7/24/07, Michael Pogue <Michael.Pogue at sun.com> wrote:
> > > How is "workstation" determined? Other OS's sometimes ask at install
> > > time, but I don't recall such a question on Solaris install....
> > >
> > > Mike
> > >
> > > Bart Smaalders wrote:
> > > > Mark Haywood wrote:
> > > >
> > > >> Because some users care more about performance than power and unless we
> > > >> have reason to think otherwise, we favor those who want performance.
> > > >> Currently, none of our x86 platforms are power managed by default.
> > > >> That's likely to change in the future when we identify systems that we
> > > >> would like to be E* compliant.
> > > >
> > > > We may wish to power manage workstations by default. Improving the
> > > > speed of power management response will also help enable this.
> > > >
> > > > - Bart
> > > >
> > > >
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> > >
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