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How do I vsync in bash (or the Linux framebuffer)?
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I was trying to see how fast I could fill/swap on /dev/fb0 with something to the effect of:
while :; do head -c $SIZE /dev/erg > /dev/fb0; head -c $SIZE /dev/zero > /dev/fb0; done
(Where /dev/erg is a character device that provides a constant stream of "erg".)
It tore quite a bit--clearly, this doesn't actually respect vsync settings.
The question might be a bit evocative; I'm aware this isn't the normal use case for /dev/fb0 or the framebuffer devices in general (and also that they're really old and not favorable compared to drm, etc.), but what was more surprising is that I can't see any way of detecting/doing vsync with the framebuffer devices in general. Does one exist, and how might one use it? (I wouldn't be disappointed if the answer is "no".)
For at least this case, the display driver is i915, if that matters.
linux bash framebuffer
asked 3 hours ago
p-valentinep-valentine
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I was trying to see how fast I could fill/swap on /dev/fb0 with something to the effect of:
while :; do head -c $SIZE /dev/erg > /dev/fb0; head -c $SIZE /dev/zero > /dev/fb0; done
(Where /dev/erg is a character device that provides a constant stream of "erg".)
It tore quite a bit--clearly, this doesn't actually respect vsync settings.
The question might be a bit evocative; I'm aware this isn't the normal use case for /dev/fb0 or the framebuffer devices in general (and also that they're really old and not favorable compared to drm, etc.), but what was more surprising is that I can't see any way of detecting/doing vsync with the framebuffer devices in general. Does one exist, and how might one use it? (I wouldn't be disappointed if the answer is "no".)
For at least this case, the display driver is i915, if that matters.
linux bash framebuffer
asked 3 hours ago
p-valentinep-valentine
61
New contributor
p-valentine is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
I was trying to see how fast I could fill/swap on /dev/fb0 with something to the effect of:
while :; do head -c $SIZE /dev/erg > /dev/fb0; head -c $SIZE /dev/zero > /dev/fb0; done
(Where /dev/erg is a character device that provides a constant stream of "erg".)
It tore quite a bit--clearly, this doesn't actually respect vsync settings.
The question might be a bit evocative; I'm aware this isn't the normal use case for /dev/fb0 or the framebuffer devices in general (and also that they're really old and not favorable compared to drm, etc.), but what was more surprising is that I can't see any way of detecting/doing vsync with the framebuffer devices in general. Does one exist, and how might one use it? (I wouldn't be disappointed if the answer is "no".)
For at least this case, the display driver is i915, if that matters.
linux bash framebuffer
asked 3 hours ago
p-valentinep-valentine
61
New contributor
p-valentine is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
I was trying to see how fast I could fill/swap on /dev/fb0 with something to the effect of:
while :; do head -c $SIZE /dev/erg > /dev/fb0; head -c $SIZE /dev/zero > /dev/fb0; done
(Where /dev/erg is a character device that provides a constant stream of "erg".)
It tore quite a bit--clearly, this doesn't actually respect vsync settings.
The question might be a bit evocative; I'm aware this isn't the normal use case for /dev/fb0 or the framebuffer devices in general (and also that they're really old and not favorable compared to drm, etc.), but what was more surprising is that I can't see any way of detecting/doing vsync with the framebuffer devices in general. Does one exist, and how might one use it? (I wouldn't be disappointed if the answer is "no".)
For at least this case, the display driver is i915, if that matters.
linux bash framebuffer
linux bash framebuffer
asked 3 hours ago
p-valentinep-valentine
61
New contributor
p-valentine is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 3 hours ago
p-valentinep-valentine
61
New contributor
p-valentine is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 3 hours ago
p-valentinep-valentine
61
New contributor
p-valentine is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 3 hours ago
p-valentinep-valentine
61
asked 3 hours ago
p-valentinep-valentine
61
61
New contributor
p-valentine is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
p-valentine is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
p-valentine is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
add a comment |
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