/usr/share/jasper-initramfs/sysctl/30-jasper-root-on-sd.conf is in jasper 0.69.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 | # The values below try to reduce disk writes, they were put in place
# by the jasper-initramfs package during first boot of this computer.
# If you encounter problems due to the settings please file a bug
# against the jasper-initramfs ubuntu package.
vm.swappiness = 0
vm.vfs_cache_pressure=50
vm.dirty_background_ratio = 20
vm.dirty_expire_centisecs = 0
vm.dirty_ratio = 80
vm.dirty_writeback_centisecs = 6000
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