linux-kernel - Re: [PATCH] sched: Reduce contention in update_cfs_rq_blocked

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Date:	Fri, 8 Aug 2014 02:02:39 +0800
From:	Yuyang Du <yuyang.du@...el.com>
To:	Jason Low <jason.low2@...com>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org,
	Ben Segall <bsegall@...gle.com>,
	Waiman Long <Waiman.Long@...com>, Mel Gorman <mgorman@...e.de>,
	Mike Galbraith <umgwanakikbuti@...il.com>,
	Rik van Riel <riel@...hat.com>,
	Aswin Chandramouleeswaran <aswin@...com>,
	Chegu Vinod <chegu_vinod@...com>,
	Scott J Norton <scott.norton@...com>
Subject: Re: [PATCH] sched: Reduce contention in update_cfs_rq_blocked_load

On Wed, Aug 06, 2014 at 11:21:35AM -0700, Jason Low wrote:
> I ran these tests with most of the AIM7 workloads to compare its
> performance between a 3.16 kernel and the kernel with these patches
> applied.
> 
> The table below contains the percent difference between the baseline
> kernel and the kernel with the patches at various user counts. A
> positive percent means the kernel with the patches performed better,
> while a negative percent means the baseline performed better.
> 
> Based on these numbers, for many of the workloads, the change was
> beneficial in those highly contended, while it had - impact in many
> of the lightly/moderately contended case (10 to 90 users).
> 
> -----------------------------------------------------
>               |   10-90   |  100-1000   |  1100-2000
>               |   users   |   users     |   users
> -----------------------------------------------------
> alltests      |   -3.37%  |  -10.64%    |   -2.25%
> -----------------------------------------------------
> all_utime     |   +0.33%  |   +3.73%    |   +3.33%
> -----------------------------------------------------
> compute       |   -5.97%  |   +2.34%    |   +3.22%
> -----------------------------------------------------
> custom        |  -31.61%  |  -10.29%    |  +15.23%
> -----------------------------------------------------
> disk          |  +24.64%  |  +28.96%    |  +21.28%
> -----------------------------------------------------
> fserver       |   -1.35%  |   +4.82%    |   +9.35%
> -----------------------------------------------------
> high_systime  |   -6.73%  |   -6.28%    |  +12.36%
> -----------------------------------------------------
> shared        |  -28.31%  |  -19.99%    |   -7.10%
> -----------------------------------------------------
> short         |  -44.63%  |  -37.48%    |  -33.62%
> -----------------------------------------------------
> 
Thanks, Jason. Sorry for late response.

What about the variation of the tests? The machine you test on?

Yuyang
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