linux-kernel - Re: Question about fair schedulers

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Message-ID: <4681045D.2080105@aitel.hist.no>
Date:	Tue, 26 Jun 2007 14:19:41 +0200
From:	Helge Hafting <helge.hafting@...el.hist.no>
To:	Alberto Gonzalez <info@...bu.es>
CC:	Kyle Moffett <mrmacman_g4@....com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Question about fair schedulers

Alberto Gonzalez wrote:
> On Saturday 23 June 2007, Kyle Moffett wrote:
>   
>> On Jun 22, 2007, at 18:07:15, Alberto Gonzalez wrote:
>>     
>>> Ok, so what will a fair scheduler do in this case? It is my
>>> understanding that it would give 50% CPU to each task, resulting in
>>> the video dropping frames. Is this correct?
>>>       
>> Yes, that's correct.
>>
>> What this *actually* means is that you want the media player to have
>> higher priority than the DVD ripping program.  Ergo you should run
>> "nice +20 my_dvd_burner" or "nice +20 my_vorbis_encoder" under CFS or
>> other fair schedulers.
>>     
>
> Ok, that makes sense. The problem is that desktop users don't know about such 
> things, so the ideal situation would be that the scheduler knows about it and 
> does it for you.
>   
Well, the scheduler can't really know that.  But the people who
write the dvd burning/ripping/encoding/viewing software
know what is needed, they can write their programs so they set useful 
priorities.

Helge Hafting
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