linux-kernel - Re: [linux-pm] [PATCH 0/8] Suspend block api (version 8)

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Date:	Mon, 31 May 2010 08:55:33 +0300
From:	Igor Stoppa <igor.stoppa@...ia.com>
To:	ext Felipe Contreras <felipe.contreras@...il.com>
CC:	ext Brian Swetland <swetland@...gle.com>,
	ext Matthew Garrett <mjg59@...f.ucam.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	"tytso@....edu" <tytso@....edu>,
	Peter Zijlstra <peterz@...radead.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Florian Mickler <florian@...kler.org>,
	Linux PM <linux-pm@...ts.linux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Linux OMAP Mailing List <linux-omap@...r.kernel.org>,
	"Balbi Felipe (Nokia-D/Helsinki)" <felipe.balbi@...ia.com>
Subject: Re: [linux-pm] [PATCH 0/8] Suspend block api (version 8)

ext Felipe Contreras wrote:

> I think this information can be obtained dynamically while the
> application is running,

yes, that was the idea

>  and perhaps the limits can be stored. It would
> be pretty difficult for the applications to give this kind of
> information because there are so many variables.
>
> For example, an media player can tell you: this clip has 24 fps, but
> if the user is moving the time slider, the fps would increase and drop
> very rapidly, and how much depends at least on the container format
> and type of seek.
>   

I doubt that belongs to typical QoS. Maybe the target could be to be 
able to decode a sequence of i-frames?
> A game or a telephony app could tell you "I need real-time priority"
> but so much as giving the details of latency and bandwidth? I find
> that very unlikely.
>   

from my gaming days the games were still evaluated in fps ... maybe i 
made the wrong assumption?

A telephony app should still be able to tell if it's dropping audio frames.

In all cases there should be some device independent limit - like: what 
is the sort of degradation that is considered acceptable by the typical 
user?

Tuning might be offered, but at least this should set some sane set of 
defaults.

igor
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