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Date: Sun, 24 Feb 2013 12:11:09 +0100
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To: Julian Elischer <julian@freebsd.org>
Subject: Re: Scrolling in framebuffer syscons
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Cc: Oleksandr Tymoshenko <gonzo@freebsd.org>, freebsd-hackers@freebsd.org
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Julian Elischer wrote:

>
> not sure if it's relevent, but remember that updating the screen mor ethan 50
> times a second is pointless.
> I'm not sure if the curent video console does it but having the final copy only
> done on 50Hz ticks can save a lot of copying.
>

Right, but then you have to handle VSYNC hardware interrupts and copy 
framebuffer data from system memory to video memory.

regards