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

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Message-ID: <CAKohpomkGxUy6-7tByBjQvAGSUn4EdVCpGo+94fn7vF8YgKRLQ@mail.gmail.com>
Date:	Fri, 29 Mar 2013 12:57:23 +0530
From:	Viresh Kumar <viresh.kumar@...aro.org>
To:	Tejun Heo <tj@...nel.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

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):
---------------------------------------------------

0.151162                2.183545                2.334707
0.223730                2.687067                2.910797
0.289687                2.732702                3.022389
0.454198                2.745908                3.200106
0.495552                2.746465                3.242017

Average:
0.322866                2.619137                2.942003


With this patchset (Energy in Joules):
-----------------------------------------------

0.133361                2.267822                2.401183
0.260626                2.833389                3.094015
0.142365                2.277929                2.420294
0.246793                2.582550                2.829343
0.130462                2.257033                2.387495

Average:
0.182721                2.443745                2.626466


With WQ Unbound (Energy in Joules):
-----------------------------------------------

0.226421                2.283658                2.510079
0.151361                2.236656                2.388017
0.197726                2.249849                2.447575
0.221915                2.229446                2.451361
0.347098                2.257707                2.604805

Average:
0.2289042              2.2514632              2.4803674

PS: I have to add another generic workqueue for these tests:
system_unbound_freezable_wq as block layer was using
system_freezable_wq.

--
viresh
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