linux-kernel - Re: Sched - graphic smoothness under load

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Date:	Wed, 23 May 2007 16:45:44 -0400
From:	Bill Davidsen <davidsen@....com>
To:	Miguel Figueiredo <elmig@...ianpt.org>
CC:	Ray Lee <ray-lk@...rabbit.org>,
	Linux Kernel M/L <linux-kernel@...r.kernel.org>,
	Con Kolivas <kernel@...ivas.org>
Subject: Re: Sched - graphic smoothness under load - cfs-v13 sd-0.48

Miguel Figueiredo wrote:
> Bill Davidsen wrote:
>> I was unable to reproduce the numbers Miguel generated, comments 
>> below. The -ck2 patch seems to run nicely, although the memory 
>> repopulation from swap would be most useful on system which have a 
>> lot of memory pressure.
>>
>> I spent a few hours running the -ck2 patch, and I didn't see any 
>> numbers like yours. What I did see is going up with my previous 
>> results as http://www.tmr.com/~davidsen/sched_smooth_04.html. While 
>> there were still some minor pauses in glxgears with my test, 
>> performance was very similar to the sd-0.48 results. And I did try 
>> watching video with high load, without problems. Only when I run a 
>> lot of other screen-changing processes can I see pauses in the display.
>>> Your subjective impressions would be helpful, and you may find that 
>>> the package in the www.tmr.com/~public/source is slightly easier to 
>>> use and gives more stable results. The documentation suggests the 
>>> way to take samples (the way I did it) but if you feel more or 
>>> longer samples would help it is tunable.
>>>
>>> I added Con to the cc list, he may have comments or suggestions 
>>> (against the current versions, please). Or he may feel that video 
>>> combined with other heavy screen updating is unrealistic or not his 
>>> chosen load. I'm told the load is similar to games which use threads 
>>> and do lots of independent action, if that's a reference.
>>>
>> I'll include the -ck2 patch in my testing on other hardware.
>>
>
> Hi Bill,
>
>  the numbers i posted before are repeatable on that machine.
>
The numbers you posted in <46534C31.1060306@...ianpt.org> are not the 
same... From my inbox I grab some very non-matching values:
=====
Here's the funny part...

Lets call:

a) to "random number of processes run while glxgears is running", 
gl_fairloops file

b) to "generated frames while running a burst of processes" aka "massive 
and uknown amount of operations in one process", gl_gears file

kernel    2.6.21-cfs-v13    2.6.21-ck2
a)    194464        254669       
b)    54159        124
=====

The numbers in your glitch1.html file show a close correlation for cfs 
and -ck2, well within what I would expect. The stddev for the loops is 
larger for -cf2, but not out of line with what I see, and nothing like 
the numbers you originally sent me (which may have been testing 
something else, or from an old version before I made improvements, or 
???). In any case thanks for testing.

>
> I did run, again, glitch1 on my laptop (T2500 CoreDuo, also Nvidia) 
> please check: http://www.debianpt.org/~elmig/pool/kernel/20070523/
>
>
Thanks, those data seem as expected.

-- 
bill davidsen <davidsen@....com>
  CTO TMR Associates, Inc
  Doing interesting things with small computers since 1979

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