Re: Why X11 via unaccelerated driver is faster than via frame buffer driver?

[Michael <macallan%netbsd.org@localhost>]

Hello,

On Wed, 13 Apr 2016 18:34:35 +0300
Alex <lausgans%gmail.com@localhost> wrote:

> Does anybody knows why on (some?) old platforms, an unaccelerated*
> dedicated graphics driver (for example xf86-video-suncg6) is faster
> than non-shadowfb backed frame buffer device driver**?

Actually, there is a difference. suncg6 will still use a hardware
sprite for the mouse cursor, while wsfb won't ( I never implemented
those ioctl()s for cgsix since it takes extra work to run wsfb with
zero benefit, so it's not exactly high on my todo list ) - especially
on slow machines that will make a noticeable difference. With a
software cursor the Xserver has to keep track of where the cursor is
and undraw/redraw it whenever it collides with a graphics operation.

have fun
Michael