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zfs.4: document the zfs_arc_free_target parameter

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Document the FreeBSD-specific zfs_arc_free_target tunable which
controls the number of free pages below which the ARC triggers
reclaim. Note its initialization from vm.v_free_target and its
distinction from the Linux-specific zfs_arc_sys_free.

Reviewed-by: Brian Behlendorf <[email protected]>
Reviewed-by: Alexander Motin <[email protected]>
Signed-off-by: Christos Longros <[email protected]>
Closes #18350
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Christos Longros authored and GitHub committed 2026-03-31 15:42:00 -07:00
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man/man4/zfs.4
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@@ -1008,6 +1008,17 @@ Value of 4 means parity with page cache.
The target number of bytes the ARC should leave as free memory on the system.
If zero, equivalent to the bigger of
.Sy 512 KiB No and Sy all_system_memory/64 .
.It Sy zfs_arc_free_target Pq uint
Desired number of free pages below which the ARC
triggers reclaim.
Initialized at boot to the kernel's
.Va vm.v_free_target
value and can be adjusted at runtime.
This parameter is
.Fx Ns -specific
and uses pages, unlike the Linux-specific
.Sy zfs_arc_sys_free
which is measured in bytes.
.
.It Sy zfs_checksum_events_per_second Ns = Ns Sy 20 Ns /s Pq uint
Rate limit checksum events to this many per second.