linux-kernel - Re: [PATCH 7/7] ondemand: Solve the big performance issue with ondemand during disk IO

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Date:	Tue, 27 Apr 2010 13:39:34 +0200
From:	Thomas Renninger <trenn@...e.de>
To:	Arjan van de Ven <arjan@...radead.org>
Cc:	Willy Tarreau <w@....eu>, Pavel Machek <pavel@....cz>,
	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	mingo@...e.hu, peterz@...radead.org, tglx@...utronix.de,
	davej@...hat.com, cpufreq@...r.kernel.org
Subject: Re: [PATCH 7/7] ondemand: Solve the big performance issue with ondemand during disk IO

On Friday 23 April 2010 06:08:19 pm Arjan van de Ven wrote:
> On Fri, 23 Apr 2010 10:50:10 +0200
> Thomas Renninger <trenn@...e.de> wrote:
>  Especially on battery, users will appreciate some minutes
>
> > of more battery lifetime and do not care about some ms of IO
> > latencies.
>
> the assumption that power doesn't matter on AC is a huge fiction
> that any data center operator would love to get out of everyones head
> as quickly as possible.

Have I said power doesn't matter on AC?
Do you agree that a datacenter has different performance vs power 
tradeoff demands as a battery driven mobile device?

Back to the topic:
As you did not answer on my (several) sysfs knob request(s), I expect
you agree with it and will add one.

It's not only for real usage, but to give people a chance to easily
test and get feedback on different HW.

Thanks,

  Thomas
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