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

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Date:	Fri, 19 Jul 2013 12:28:10 -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 Fri, 2013-07-19 at 16:54 +0530, Preeti U Murthy wrote:
> Hi Json,
> 
> I ran ebizzy and kernbench benchmarks on your 3.11-rc1 + your        "V1
> patch" on a 1 socket, 16 core powerpc machine. I thought I would let you
> know the results before I try your V2.
> 
> Ebizzy: 30 seconds run. The table below shows the improvement in the
> number of records completed. I have not spent enough time on the patch
> to explain such a big improvement.
> 
> Number_of_threads   %improvement_with_patch
>     4                          41.86%
>     8                          9.8%
>    12                          34.77%
>    16                          28.37%
> 
> While on kernbench there was no significant change in the observation.
> 
> I will try patch V2 and let you know the results.

Great to see those improvements so far. Thank you for testing this.

Jason

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