Re: [RFC v1] Tunable sched_mc_power_savings=n

[David Collier-Brown]

KOSAKI Motohiro wrote:
> Hi
>
>
> > Advantages:
> >
> > * Enterprise workloads on large hardware configurations may need
> >  aggressive consolidation strategy
> > * Performance impact on server is different from desktop or laptops.
> >  Interactivity is less of a concern on large enterprise servers while
> >  workload response times and performance per watt is more significant
> > * Aggressive power savings even with marginal performance penalty is
> >  is a useful tunable for servers since it may provide good
> >  performance-per-watt at low utilisation
> > * This tunable can influence other parts of scheduler like wakeup
> >  biasing for overall task consolidation  
>
>
> I'd like to know how many saving power.
> if there are only small saving, I think this is not interesting feature.
>
> Do you expect how many percentage saving?

An experiment using DVFS on Xeon yeilded a 15-watt allowable reduction
even under running a considerable TPC-W workload.  Lesser loads allowed
a 40-watt (out of 160) reduction.  

--dave
--
David Collier-Brown            | Always do right. This will gratify
Sun Microsystems, Toronto      | some people and astonish the rest
davecb@xxxxxxx                 |                      -- Mark Twain
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