Re: [RFC PATCH v2 0/2] Saving power by cpu evacuation sched_max_capacity_pct=n

Andi Kleen
2009-05-13T15:05:40Z

> > Yes that's fine and common, but you actually need to save power for this,
> > which throttling doesn't do.
> >
> > My understanding this work is a extension of the existing
> > sched_mc_power_savings features that tries to be optionally more
> > aggressive to keep complete package idle so that package level
> > power saving kicks in.
> >
> > I'm just requesting that they don't call that throttling.
>
> Ah no, this work differs in that regard in that it actually 'generates'
> idle time, instead of optimizing idle time.

That is what i meant with "more aggressive to keep complete packages idle"
above.

>
> Therefore it takes actual cpu time away from real work, which is
> throttling. Granted, one could call it limiting or similar, but
> throttling is a correct name.

That will be always ongoing confusion with the existing established
term.

If you really need to call it throttling use "scheduler throttling"
or something like that, but a different word would be better.

-Andi
--
ak@linux.intel.com -- Speaking for myself only.