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Restore FreeBSD sysctl processing for arc.min and arc.max

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Before OpenZFS 2.0, trying to set the FreeBSD sysctl vfs.zfs.arc_max
to a disallowed value would return an error.
Since the switch, it instead only generates WARN_IF_TUNING_IGNORED

Keep the ability to set the sysctl's specifically to 0, even though
that is less than the minimum, because some tests depend on this.

Also lost, was the ability to set vfs.zfs.arc_max to a value less
than the default vfs.zfs.arc_min at boot time. Restore this as well.

Reviewed-by: Tony Nguyen <tony.nguyen@delphix.com>
Reviewed-by: Ryan Moeller <ryan@ixsystems.com>
Signed-off-by: Allan Jude <allan@klarasystems.com>
Closes #12161
This commit is contained in:
Allan Jude
2021-08-16 11:35:19 -04:00
committed by GitHub
parent 41bee4039c
commit e945e8d7f4
6 changed files with 98 additions and 6 deletions
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include/sys/arc.h
+7
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@@ -46,6 +46,13 @@ extern "C" {
*/
#define ARC_EVICT_ALL UINT64_MAX
/*
* ZFS gets very unhappy when the maximum ARC size is smaller than the maximum
* block size and a larger block is written. To leave some safety margin, we
* limit the minimum for zfs_arc_max to the maximium transaction size.
*/
#define MIN_ARC_MAX DMU_MAX_ACCESS
#define HDR_SET_LSIZE(hdr, x) do { \
ASSERT(IS_P2ALIGNED(x, 1U << SPA_MINBLOCKSHIFT)); \
(hdr)->b_lsize = ((x) >> SPA_MINBLOCKSHIFT); \