linux-kernel - Re: [RFC v1] Tunable sched_mc_power

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Message-Id: <20080627170514.7A88.KOSAKI.MOTOHIRO@jp.fujitsu.com>
Date:	Fri, 27 Jun 2008 17:08:22 +0900
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Linux Kernel <linux-kernel@...r.kernel.org>,
	Suresh B Siddha <suresh.b.siddha@...el.com>,
	Venkatesh Pallipadi <venkatesh.pallipadi@...el.com>,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Dipankar Sarma <dipankar@...ibm.com>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	Vatsa <vatsa@...ux.vnet.ibm.com>,
	Gautham R Shenoy <ego@...ibm.com>
Cc:	kosaki.motohiro@...fujitsu.com
Subject: Re: [RFC v1] Tunable sched_mc_power_savings=n

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?



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