linux-kernel - Re: [PATCH] sched: rsdl improvements

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Date:	Wed, 21 Mar 2007 18:48:27 -0500
From:	Jeffrey Hundstad <jeffrey.hundstad@...u.edu>
To:	Artur Skawina <art_k@...pl>
CC:	Con Kolivas <kernel@...ivas.org>,
	linux list <linux-kernel@...r.kernel.org>,
	ck list <ck@....kolivas.org>, Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] sched: rsdl improvements

Artur Skawina wrote:
> Con Kolivas wrote:
>   
>> Note no interactive boost idea here.
>>
>> Patch is for 2.6.21-rc4-mm1. I have not spent the time trying to bring other
>> bases in sync.
>>     
>
> I've tried RSDLv.31+this on 2.6.20.3 as i'm not tracking -mm.
>
>   
>> Further improve the deterministic nature of the RSDL cpu scheduler and make
>> the rr_interval tunable.
>>
>> By only giving out priority slots to tasks at the current runqueue's
>> prio_level or below we can make the cpu allocation not altered by accounting
>> issues across major_rotation periods. This makes the cpu allocation and
>> latencies more deterministic, and decreases maximum latencies substantially.
>> This change removes the possibility that tasks can get bursts of cpu activity
>> which can favour towards interactive tasks but also favour towards cpu bound
>> tasks which happen to wait on other activity (such as I/O) and is a net
>> gain.
>>     
>
> I'm not sure this is going in the right direction... I'm writing
> this while compiling a kernel w/ "nice -20 make -j2" and X is almost
>   
Did you mean "nice -20"?  If so, that should have slowed X quite a bit.  
Try "nice 19" instead.

nice(1):
       Run  COMMAND  with an adjusted niceness, which affects process 
scheduling.  With no COMMAND, print the current  niceness.   Nicenesses  
range from -20 (most favorable scheduling) to 19 (least favorable).


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