Hi

Am 18.01.22 um 09:10 schrieb Geert Uytterhoeven:

Hi Gerd,

On Tue, Jan 18, 2022 at 7:30 AM Gerd Hoffmann [off-list ref] wrote:

quoted

Also note that using a shadow framebuffer allows to decouple fbcon
updates and scanout framebuffer updates.  Can be used to speed up
things without depending on the 2d blitter.

Assuming accesses to the shadow frame buffer are faster than accesses
to the scanout frame buffer. While this is true on modern hardware,
this is not the case on all hardware.  Especially if the shadow frame
buffer has a higher depth (XRGB8888) than the scanout frame buffer
(e.g. Cn)...

The funny thing is that the systems we are interested in, once used
to be known for their graphics capabilities and/or performance...

What I still don't understand: why are you so keen on maintaining an 
interface that only serves the console? Nothing else uses fbdev these 
days. Why not improve DRM/userspace to the point where it fits your 
requirements? Long-term, the latter would make a lot more sense.

Best regards
Thomas

Gr{oetje,eeting}s,

                         Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                 -- Linus Torvalds

-- 
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 Nürnberg, Germany
(HRB 36809, AG Nürnberg)
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