Default is 50% (of available RAM) - see man:tmpfs
So if you want to change it, modify the fstab entry to specify the size.....
Mount options
The tmpfs filesystem supports the following mount options:
size=bytes
Specify an upper limit on the size of the filesystem. The size is given in bytes, and rounded up to entire pages. The limit is removed
if the size is 0.
The size may have a k, m, or g suffix for Ki, Mi, Gi (binary kilo (kibi), binary mega (mebi), and binary giga (gibi)).
The size may also have a % suffix to limit this instance to a percentage of physical RAM.
The default, when neither size nor nr_blocks is specified, is size=50%.
Statistics: Posted by mitu — Sat Feb 21, 2026 1:54 pm