linux-kernel - Re: [PATCH V3 3/7] workqueue: Add helpers to schedule work on any cpu

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Date:	Fri, 29 Mar 2013 10:40:03 -0700
From:	Tejun Heo <tj@...nel.org>
To:	Viresh Kumar <viresh.kumar@...aro.org>
Cc:	pjt@...gle.com, paul.mckenney@...aro.org, tglx@...utronix.de,
	mingo@...hat.com, peterz@...radead.org, rostedt@...dmis.org,
	linaro-kernel@...ts.linaro.org, robin.randhawa@....com,
	Steve.Bannister@....com, Liviu.Dudau@....com,
	charles.garcia-tobin@....com, Arvind.Chauhan@....com,
	linux-rt-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH V3 3/7] workqueue: Add helpers to schedule work on any cpu

Hello, Viresh.

On Fri, Mar 29, 2013 at 12:57:23PM +0530, Viresh Kumar wrote:
> On 28 March 2013 23:43, Tejun Heo <tj@...nel.org> wrote:
> > Viresh, would it be difficult to make another measurement of the same
> > workload with the said workqueues converted to unbound?  I think that
> > would at least provide a nice reference point.
> 
> My heart is shattered after getting the results :)
> 
> 
> Cluster A15 Energy      Cluster A7 Energy       Total
> -------------------------      -----------------------       ------
> 
> Without this patchset (Energy in Joules):
> ---------------------------------------------------
> 0.322866                2.619137                2.942003
> 
> 
> With this patchset (Energy in Joules):
> -----------------------------------------------
> 0.182721                2.443745                2.626466
> 
> 
> With WQ Unbound (Energy in Joules):
> -----------------------------------------------
> 0.2289042              2.2514632              2.4803674


So the scheduler does know what it's doing after all, which is a nice
news.  Given the result, the best thing to do would be somehow marking
these workqueues as unbound for powersaving?

Thanks!

-- 
tejun
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