On Tuesday, January 18th, 2022 at 15:23, Thomas Zimmermann <tzimmermann@xxxxxxx> wrote: > Am 18.01.22 um 09:10 schrieb Geert Uytterhoeven: > > Hi Gerd, > > > > On Tue, Jan 18, 2022 at 7:30 AM Gerd Hoffmann <kraxel@xxxxxxxxxx> wrote: > >> 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. +1 If you need any help with adapting user-space, feel free to ping me. I'd be interested in discussing, providing feedback and potentially user-space patches.
