linux-kernel - Re: [RFC PATCH v2] sched: Limit idle

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Message-ID: <1374514943.7608.25.camel@j-VirtualBox>
Date:	Mon, 22 Jul 2013 10:42:23 -0700
From:	Jason Low <jason.low2@...com>
To:	Preeti U Murthy <preeti@...ux.vnet.ibm.com>
Cc:	Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Mike Galbraith <efault@....de>,
	Thomas Gleixner <tglx@...utronix.de>,
	Paul Turner <pjt@...gle.com>, Alex Shi <alex.shi@...el.com>,
	Vincent Guittot <vincent.guittot@...aro.org>,
	Morten Rasmussen <morten.rasmussen@....com>,
	Namhyung Kim <namhyung@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Kees Cook <keescook@...omium.org>,
	Mel Gorman <mgorman@...e.de>, Rik van Riel <riel@...hat.com>,
	aswin@...com, scott.norton@...com, chegu_vinod@...com,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
Subject: Re: [RFC PATCH v2] sched: Limit idle_balance()

On Sun, 2013-07-21 at 23:02 +0530, Preeti U Murthy wrote:
> Hi Json,
> 
> With V2 of your patch here are the results for the ebizzy run on
> 3.11-rc1 + patch on  a 1 socket, 16 core powerpc machine. Each ebizzy
> run was for 30 seconds.
> 
> Number_of_threads         %improvement_with_patch
>     4                        8.63
>     8                        1.29
>     12                       9.98
>     16                      20.46
> 
> Let me know if you want me to profile any of these runs for specific
> statistics.

Hi Preeti,

Other numbers that would be interesting to know are the % improvements
when N = 20. That is when I'm getting the bigger performance boosts on
some of the AIM7 workloads.

Would you like to re-run ebizzy with v2 of my patch except replacing
this line of code:
	if (idle_duration / 10 < (sd->avg_idle_balance_cost + cost))
with this line of code:
	if (idle_duration / 20 < (sd->avg_idle_balance_cost + cost))

Thanks a lot,
Jason

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