linux-kernel - Re: [RFC] sched: The removal of idle

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Date:	Sun, 17 Feb 2013 16:54:49 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Mike Galbraith <efault@....de>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Paul Turner <pjt@...gle.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Clark Williams <clark@...hat.com>,
	Andrew Theurer <habanero@...ibm.com>
Subject: Re: [RFC] sched: The removal of idle_balance()

On Sun, 2013-02-17 at 08:14 +0100, Mike Galbraith wrote:

> (And puts a dent in x264 ultrafast)
> 
> +SD_BALANCE_NEWIDLE
> encoded 600 frames, 425.04 fps, 22132.71 kb/s
> encoded 600 frames, 416.07 fps, 22132.71 kb/s
> encoded 600 frames, 417.49 fps, 22132.71 kb/s
> encoded 600 frames, 420.65 fps, 22132.71 kb/s
> encoded 600 frames, 425.55 fps, 22132.71 kb/s
> encoded 600 frames, 425.58 fps, 22132.71 kb/s
> encoded 600 frames, 426.18 fps, 22132.71 kb/s
> encoded 600 frames, 424.21 fps, 22132.71 kb/s
> encoded 600 frames, 422.20 fps, 22132.71 kb/s
> encoded 600 frames, 423.15 fps, 22132.71 kb/s
> 
> -SD_BALANCE_NEWIDLE
> encoded 600 frames, 378.52 fps, 22132.71 kb/s
> encoded 600 frames, 378.75 fps, 22132.71 kb/s
> encoded 600 frames, 378.20 fps, 22132.71 kb/s
> encoded 600 frames, 372.54 fps, 22132.71 kb/s
> encoded 600 frames, 366.69 fps, 22132.71 kb/s
> encoded 600 frames, 378.46 fps, 22132.71 kb/s
> encoded 600 frames, 379.89 fps, 22132.71 kb/s
> encoded 600 frames, 382.25 fps, 22132.71 kb/s
> encoded 600 frames, 384.10 fps, 22132.71 kb/s
> encoded 600 frames, 375.24 fps, 22132.71 kb/s

What about my last patch? The one that avoids idle_balance() if the
previous task was in a task_uninterruptible state. That one gave the
same performance increase that removing idle_balance() did on my box.

-- Steve



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