linux-kernel - Re: sched: Consequences of integrating the Per Entity Load Tracking Metric into the Load Balancer

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Date:	Sun, 20 Jan 2013 23:52:20 +0800
From:	Alex Shi <alex.shi@...el.com>
To:	Preeti U Murthy <preeti@...ux.vnet.ibm.com>
CC:	Vincent Guittot <vincent.guittot@...aro.org>,
	Mike Galbraith <bitbucket@...ine.de>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	LKML <linux-kernel@...r.kernel.org>,
	"svaidy@...ux.vnet.ibm.com" <svaidy@...ux.vnet.ibm.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Viresh Kumar <viresh.kumar@...aro.org>,
	Amit Kucheria <amit.kucheria@...aro.org>,
	Morten Rasmussen <Morten.Rasmussen@....com>,
	Paul McKenney <paul.mckenney@...aro.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	Ingo Molnar <mingo@...nel.org>, Paul Turner <pjt@...gle.com>,
	Venki Pallipadi <venki@...gle.com>,
	Robin Randhawa <robin.randhawa@....com>,
	Lists linaro-dev <linaro-dev@...ts.linaro.org>
Subject: Re: sched: Consequences of integrating the Per Entity Load Tracking
 Metric into the Load Balancer

>>> The blocked load of a cluster will be high if the blocked tasks have
>>> run recently. The contribution of a blocked task will be divided by 2
>>> each 32ms, so it means that a high blocked load will be made of recent
>>> running tasks and the long sleeping tasks will not influence the load
>>> balancing.
>>> The load balance period is between 1 tick (10ms for idle load balance
>>> on ARM) and up to 256 ms (for busy load balance) so a high blocked
>>> load should imply some tasks that have run recently otherwise your
>>> blocked load will be small and will not have a large influence on your
>>> load balance
> 
> Just tried using cfs's runnable_load_avg + blocked_load_avg in
> weighted_cpuload() with my v3 patchset, aim9 shared workfile testing
> show the performance dropped 70% more on the NHM EP machine. :(
> 

Ops, the performance is still worse than just count runnable_load_avg.
But dropping is not so big, it dropped 30%, not 70%.

-- 
Thanks
    Alex
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