https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=276402
Bug ID: 276402
Summary: tmpfs: memory reserve does not account for ARC
Product: Base System
Version: 15.0-CURRENT
Hardware: Any
OS: Any
Status: New
Severity: Affects Many People
Priority: ---
Component: kern
Assignee: [email protected]
Reporter: [email protected]
When there is tmpfs entry in fstab without size specified, e.g.
none /var/run/user tmpfs rw
And ZFS ARC fills available memory fully, writes to tmpfs will fail with no
space left on device, ARC won't be reclaimed. This results in hangs when
switching browser tabs or spawning Wayland clients in e.g. x11-wm/sway which
uses XDG_RUNTIME_DIR on tmpfs.
Disabling memory reserve with
sysctl vfs.tmpfs.memory_percent=100
restores old behavior (ARC is reclaimed for tmpfs) and gets rid of hangs in
x11-wm/sway.
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