Messages in this thread | | | Date | Fri, 27 Jun 2008 08:54:12 -0400 | From | David Collier-Brown <> | Subject | Re: [RFC v1] Tunable sched_mc_power_savings=n |
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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 bridge: (877) 385-4099 code: 506 9191#
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