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SubjectRe: OpenGL-based framebuffer concepts
On Sat, 3 Jun 2006, Pavel Machek wrote:

> Hi!
>
>>>> I just implemented text mode switch and tileblit ops into viafb
>>>> (http://davesdomain.org.uk/viafb/index.php) and it is about four
>>>> times faster than accelerated graphics mode and about eight times
>>>> faster than unaccelerated graphics mode (both measured using cat
>>>> largefile with ypan disabled). So textmode is meaningful
>>>> alternative.
>>>
>>> I mean.... it is displaying text faster than refresh rate... so who
>>> cares?
>>>
>>> You can only *display* so much text a second (and then, user is only
>>> able to see *much* less text) and both text mode and frame buffers are
>>> way past that limits. so.... who cares?
>>
>> there are quite a few times when you have text output that you need to
>> scroll through, but you really don't need to read it as it goes by.
>>
>> for example, accidently cating a large file, running a program with overly
>> verbose debugging output, etc.
>>
>> yes, if you never make mistakes and know that these are problem cases
>> ahead of time you can redirect the output. but in the real world sysadmins
>> really do notice when they are on a console that is slower.
>>
>> if reading speed was the limiting factor very few people would need
>> anything faster then a 9600 baud terminal.
>
> I'm not talking about reading speed, I'm talking about displaying
> speed. Once you display more than refresh rate times screen
> size... you may as well cheat -- xterm-like. If xterm detects too much
> stuff is being displayed, it simply stops displaying it, only
> refreshing screen few times a second...

That would work, however AFAIK it's not implemented in any existing
framebuffer.

David Lang
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