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

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Date:	Wed, 23 May 2007 22:03:58 +0100
From:	Miguel Figueiredo <elmig@...ianpt.org>
To:	Bill Davidsen <davidsen@....com>
CC:	Linux Kernel M/L <linux-kernel@...r.kernel.org>
Subject: Re: Sched - graphic smoothness under load - cfs-v13 sd-0.48

Bill Davidsen wrote:
> 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.
> 

These numbers are from a different machine (this has 2 cores).
The other machine it's Debian Unstable and this Debian stable.


-- 

Com os melhores cumprimentos/Best regards,

Miguel Figueiredo
http://www.DebianPT.org
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