linux-kernel - Re: sched: deep power-saving states

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Message-ID: <20081022125508.2ccea6e1@infradead.org>
Date:	Wed, 22 Oct 2008 12:55:08 -0700
From:	Arjan van de Ven <arjan@...radead.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Gregory Haskins <ghaskins@...ell.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Ingo Molnar <mingo@...e.hu>,
	LKML <linux-kernel@...r.kernel.org>,
	Jon Masters <jonathan@...masters.org>
Subject: Re: sched: deep power-saving states

On Wed, 22 Oct 2008 21:49:52 +0200
Peter Zijlstra <peterz@...radead.org> wrote:
> 
> This still leaves us with the worst case IRQ response as given by the
> deepest C state. Which might be un-desirable.

that's a different problem in a different problem space.
> 
> jcm was, once upon a time, working on dynamically changing the idle
> routine, so that people who care about wakeup latency can run
> idle=poll while their application runs, and the acpi C state stuff
> when nobody cares.
> 
> This could of course then be tied into the PM QoS stuff Mark has been
> doing.

in fact you already have this *exactly* today; this isn't future
technology.


-- 
Arjan van de Ven 	Intel Open Source Technology Centre
For development, discussion and tips for power savings, 
visit http://www.lesswatts.org
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