Optimal refresh rate for minimal psychovisual noise, and tuning the kernel for it.

Optimal refresh rate for minimal psychovisual noise, and tuning the kernel for it.

[Uwaysi Bin Kareem]

Peace Be With You.

I have earlier done some work with audio, and made a limiter, which can be  
downloaded at http://www.sourceforge.com/projects/pxu, along with some  
other plugins.

I extended the philosophy to video, and particulary the UI, and refresh  
rate.

I found that a refresh rate of approximately 72.586hz is optimal, and  
contains the least psychovisual noise.
Things become more lifelike, and much more information is registered by  
the human perception.

I would like to share this information with you, and a modesetting for x,  
for 1280x1024, so you can test for yourself.

I would also like to know, if there is any tunables in the linux kernel,  
that I can tweak, to further enhance it, for 72.586hz refresh rates. I  
have already enabled preemptive RCU, and full desktop preemption.

I would also like to extend the philosophy, to the HZ setting of the  
kernel, or other settings, and ask if anyone can make, or know patches,  
that makes these tunables, accesible in realtime, with a cat.

Peace Be With You.

NB: Here is also a modeline for X, which contains the 72.586hz screenmode,  
in 1280x1024 resolution.

"1280x1024" 130.612 1280 1296 1440 1688 1024 1025 1028 1066 +hsync +vsync

Re: Optimal refresh rate for minimal psychovisual noise, and tuning the kernel for it.

[Uwaysi Bin Kareem]

On Tue, 23 Mar 2010 16:22:27 +0100, Uwaysi Bin Kareem  
<uwaysi.bin.kareem@paradoxuncreated.com> wrote:

> Peace Be With You.
>
> I have earlier done some work with audio, and made a limiter, which can  
> be downloaded at http://www.sourceforge.com/projects/pxu, along with  
> some other plugins.
>
> I extended the philosophy to video, and particulary the UI, and refresh  
> rate.
>
> I found that a refresh rate of approximately 72.586hz is optimal, and  
> contains the least psychovisual noise.
> Things become more lifelike, and much more information is registered by  
> the human perception.
>
> I would like to share this information with you, and a modesetting for  
> x, for 1280x1024, so you can test for yourself.
>
> I would also like to know, if there is any tunables in the linux kernel,  
> that I can tweak, to further enhance it, for 72.586hz refresh rates. I  
> have already enabled preemptive RCU, and full desktop preemption.
>
> I would also like to extend the philosophy, to the HZ setting of the  
> kernel, or other settings, and ask if anyone can make, or know patches,  
> that makes these tunables, accesible in realtime, with a cat.
>
> Peace Be With You.
>
> NB: Here is also a modeline for X, which contains the 72.586hz  
> screenmode, in 1280x1024 resolution.
>
> "1280x1024" 130.612 1280 1296 1440 1688 1024 1025 1028 1066 +hsync +vsync
>

I did try Con Kolivas BFS patch, and turned off dynticks, and set the hz  
to 2000. That seems to be the hz most complementing the "least  
psychovisual noise" target.

Things seem much more human now, the snow falling in tuxracer intro, is  
very smooth, and jitterfree, and much more human nature, in youtube videos.

Definately something for the next generation of linux machines!

Peace Be With You.
If anyone wishes to discuss this pr. mail, please contact me through  
http://www.paradoxuncreated.com

Re: Optimal refresh rate for minimal psychovisual noise, and tuning the kernel for it.

[Uwaysi Bin Kareem]

I summed up the main points of this, in an article. Please do read.

http://www.paradoxuncreated.com/articles/Millennium/Millennium.html

Peace Be With You.

Re: Optimal refresh rate for minimal psychovisual noise, and tuning the kernel for it.

[Uwaysi Bin Kareem]

On Mon, 29 Mar 2010 04:02:40 +0200, Uwaysi Bin Kareem  
<uwaysi.bin.kareem@paradoxuncreated.com> wrote:

> I summed up the main points of this, in an article. Please do read.
>
> http://www.paradoxuncreated.com/articles/Millennium/Millennium.html
>
> Peace Be With You.
>
>
>
>
> --
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Hello.

In an attempt to follow up, on this article, I would like to see if I can  
further tune the system, with renice
or chrt (or schedtool.)

So I was wondering if you, or if you can point me to a place, where I can  
find information on common processes in a linux system, (I am using Ubuntu  
LL at the moment), and which of these are related to audiovisual  
performance, and which of these I can safely renice to 14, without  
affecting audiovisual performance. I would also like to know, if I should  
change the scheduling type, of any of the processes.

 From what I understand of processing and scheduling, some processes should  
run first, aka realtime, and consume the cpu it needs, and then "casual"  
tasks, who do regular duties, not related to audiovisual performance, for  
a certain timeslice, or virtual cpu, and then the intensive tasks, who  
consume as much cpu as they can.

I would like to try and follow such a mindset with renicing and scheduling  
tweaks.

Peace Be With you.