Re: [9front] Question re: RPI video performance

[Nicola Girardi <ng@0x80.stream>]

Quoth Kristo <kristo.ilmari@gmail.com>:
> Hi,
> 
> I happen to own the Pi 2 Model B V1.1 and I definitely can't reproduce
> this "3 chars a second" performance with the latest 9front image. For
> example, the speed of scrolling output in a rio terminal is completely
> reasonable.
> 
> 0.00u 0.01s 0.66r 	 cat /lib/words

TL;DR I have similar results for this test.

The "3 chars a second" refers to typing in acme window tags.  The "cat
/lib/words" test yields different timings based on the window height;
for a very short window it's very fast, for a fullscreen window it's
very slow.

; grep cat./ /dev/text
0.00u 0.01s 0.59r 	 cat /lib/words
0.00u 0.02s 3.04r 	 cat /lib/words
0.00u 0.00s 5.15r 	 cat /lib/words

Also, using a smaller font yields gives better results (the above is
with a large font, more suitable to my eyes).

; echo $font
/lib/font/bit/vga/vga.font
; grep cat./ /dev/text
0.00u 0.01s 0.62r 	 cat /lib/words
0.00u 0.00s 1.02r 	 cat /lib/words
0.00u 0.00s 1.61r 	 cat /lib/words

Using the vga font, typing on acme window tags is faster than 3 chars
a second, but still seeing the window below flicker all the while.