linux-kernel - Re: [sched] 143e1e28cb4: +17.9% aim7.jobs-per-min, -9.7% hackbench.throughput

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Message-ID: <20140812064156.GK9918@twins.programming.kicks-ass.net>
Date:	Tue, 12 Aug 2014 08:41:56 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Preeti U Murthy <preeti@...ux.vnet.ibm.com>
Cc:	Fengguang Wu <fengguang.wu@...el.com>,
	Vincent Guittot <vincent.guittot@...aro.org>,
	Dave Hansen <dave.hansen@...el.com>,
	LKML <linux-kernel@...r.kernel.org>, lkp@...org,
	Ingo Molnar <mingo@...nel.org>,
	Dietmar Eggemann <dietmar.eggemann@....com>
Subject: Re: [sched] 143e1e28cb4: +17.9% aim7.jobs-per-min, -9.7%
 hackbench.throughput

On Tue, Aug 12, 2014 at 09:29:19AM +0530, Preeti U Murthy wrote:
> On 08/11/2014 07:03 PM, Peter Zijlstra wrote:
> > 
> > Now I think I see why this is; we've reduced load balancing frequency
> > significantly on this machine due to:
> 
> We have also changed the value of busy_factor to 32 from 64 across all
> domains. This would contribute to increased frequency of load balancing?

Not enough to offset the changes in min/max. Lowering it makes sense
because we've increased min/max for most situations. 

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