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SubjectRe: [RFC v1] Tunable sched_mc_power_savings=n
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@sun.com | -- Mark Twain
(905) 943-1983, cell: (647) 833-9377, (800) 555-9786 x56583
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