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Message-ID: <1361138089.23152.141.camel@gandalf.local.home>
Subject: Re: [RFC] sched: The removal of idle_balance()
From: Steven Rostedt <rostedt@goodmis.org>
To: Mike Galbraith <efault@gmx.de>
Cc: LKML <linux-kernel@vger.kernel.org>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Ingo Molnar <mingo@kernel.org>, Peter Zijlstra <peterz@infradead.org>,
        Thomas Gleixner <tglx@linutronix.de>, Paul Turner <pjt@google.com>,
        Frederic Weisbecker <fweisbec@gmail.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        Arnaldo Carvalho de Melo <acme@infradead.org>,
        Clark Williams <clark@redhat.com>,
        Andrew Theurer <habanero@us.ibm.com>
Date: Sun, 17 Feb 2013 16:54:49 -0500
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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