linux-kernel - Re: [PATCH v4] sched: automated per session task groups

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Message-ID: <AANLkTimmZE0QROje3vLKJOa+uVFfNqiGNF_MJ9vt9xHW@mail.gmail.com>
Date:	Sat, 4 Dec 2010 23:55:57 +0000
From:	James Courtier-Dutton <james.dutton@...il.com>
To:	Paul Turner <pjt@...gle.com>
Cc:	Mike Galbraith <efault@....de>, Ingo Molnar <mingo@...e.hu>,
	Oleg Nesterov <oleg@...hat.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4] sched: automated per session task groups

On 3 December 2010 05:11, Paul Turner <pjt@...gle.com> wrote:
>
> I actually don't have a desktop setup handy to test "interactivity" (sad but
> true -- working on grabbing one).  But it looks better on under synthetic
> load.
>

What tools are actually used to test "interactivity" ?
I posted a tool to the list some time ago, but I don't think anyone noticed.
My tool is very simple.
When you hold a key down, it should repeat. It should repeat at a
constant predictable interval.
So, my tool just waits for key presses and times when each one occurred.
The tester simply presses a key and holds it down.
If the time between each key press is constant, it indicates good
"interactivity". If the time between each key press varies a lot, it
indicates bad "interactivity".
You can reliably test if one kernel is better than the next using
actual measurable figures.

Kind Regards

James
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