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L2ARC: Implement DWPD-based rate limiting with adaptive feed intervals

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Add DWPD (Drive Writes Per Day) rate limiting to control L2ARC write
speeds and protect SSD endurance. Write rate is constrained by the
minimum of l2arc_write_max and DWPD-calculated budget. Devices
accumulate unused write budget over 24-hour periods with automatic reset
and carry-over. Writes occur in controlled bursts (max 50MB) with
adaptive intervals to achieve target rates. Applies after initial device
fill.

Reviewed-by: Alexander Motin <alexander.motin@TrueNAS.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Ameer Hamza <ahamza@ixsystems.com>
Closes #18093
This commit is contained in:
Ameer Hamza
2025-09-25 23:24:03 +05:00
committed by Brian Behlendorf
parent b525525b44
commit d1f290f1ea
5 changed files with 184 additions and 46 deletions
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include/sys/arc_impl.h
+10
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@@ -442,6 +442,13 @@ typedef struct l2arc_dev {
*/
zfs_refcount_t l2ad_lb_count;
boolean_t l2ad_trim_all; /* TRIM whole device */
/*
* DWPD tracking with daily reset
*/
uint64_t l2ad_dwpd_writes; /* 24h bytes written */
uint64_t l2ad_dwpd_start; /* 24h period start */
uint64_t l2ad_dwpd_accumulated; /* Accumulated */
uint64_t l2ad_dwpd_bump; /* Reset trigger */
/*
* Per-device feed thread for parallel L2ARC writes
*/
@@ -1087,6 +1094,7 @@ extern uint_t zfs_arc_pc_percent;
extern uint_t arc_lotsfree_percent;
extern uint64_t zfs_arc_min;
extern uint64_t zfs_arc_max;
extern uint64_t l2arc_dwpd_limit;
extern uint64_t arc_reduce_target_size(uint64_t to_free);
extern boolean_t arc_reclaim_needed(void);
@@ -1106,6 +1114,8 @@ extern int param_set_arc_u64(ZFS_MODULE_PARAM_ARGS);
extern int param_set_arc_int(ZFS_MODULE_PARAM_ARGS);
extern int param_set_arc_min(ZFS_MODULE_PARAM_ARGS);
extern int param_set_arc_max(ZFS_MODULE_PARAM_ARGS);
extern int param_set_l2arc_dwpd_limit(ZFS_MODULE_PARAM_ARGS);
extern void l2arc_dwpd_bump_reset(void);
/* used in zdb.c */
boolean_t l2arc_log_blkptr_valid(l2arc_dev_t *dev,