linux-kernel - Re: Minimal jitter = good desktop.

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Date:	Sat, 06 Oct 2012 15:19:58 +0200
From:	Uwaysi Bin Kareem <uwaysi.bin.kareem@...adoxuncreated.com>
To:	david@...g.hm
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Minimal jitter = good desktop.

In the context of os-jitter, delay/latency is measured as jitter.

Peace Be With You.

On Sat, 06 Oct 2012 03:06:57 +0200, <david@...g.hm> wrote:

> less jitter != less latency
>
> you could (in theory) eliminate jitter by delaying every keypress  
> processed for exactly 1 second by having the code paths that process  
> keypresses faster insert delays before implementing the results.
>
> that would result in zero jitter, but horrific latency.
>
> latency is how long it takes to do something, jitter is how much the  
> latency varies.
>
> normally, if you optimize for one you make the other worse.
>
> If you optimize for latency, you try to finish everything as soon as you  
> can. Since some things take longer than others, jitter increases.
>
> David Lang
>
> On Sat, 6 Oct 2012, Uwaysi Bin Kareem wrote:
>
>> Reducing jitter seems central for many things.
>> First of all keypresses seem faster. (less jitter = less latency).
>> Doom 3 and similar jittersensitive OpenGL applications run smoothly,  
>> and better than windows. Doom 3 was also my main app to get running  
>> well, and measuring jitter in the signalpath of OpenGL improved the  
>> overall computing experience.
>>
>> Even youtube videos who are not synced to refresh, with a refresh of  
>> 60, and a videofps of 30, runs quite well.  
>> http://paradoxuncreated.com/Blog/wordpress/?p=3221
>>
>> System is responsive, and I have only had one problem, and that is  
>> packing seems not to work at the moment.
>>
>> For a fast test in Ubuntu, try  
>> http://paradoxuncreated.com/Blog/wordpress/?p=2268
>>
>> Definately a recommended config on the desktop.
>>
>> Peace Be With You.
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