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CPU usage too high, especially on old hardware #8

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bradfitz opened this issue Apr 5, 2023 · 1 comment
Open

CPU usage too high, especially on old hardware #8

bradfitz opened this issue Apr 5, 2023 · 1 comment

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@bradfitz
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bradfitz commented Apr 5, 2023

Now that #6 is fixed, I reached into the depths of my bins of Raspberry Pis and found the oldest one I had, a Model B Plus Rev 1.2.

Good news: it works!

Bad news: it uses 100% CPU in fbstatus... (draw: 1.491s, cp 111ms)

pib

But looks like some of the text drawing can be optimized, keeping around the previous frame and shifting some lines up, and caching some pre-rendered glyphs (they're fixed-width w/o ligatures, constant background, etc).
@stapelberg
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Oops! Yeah, reducing CPU usage would be great. Improvements welcome :)

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@bradfitz @stapelberg