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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/os/freebsd/spl/sys/mod.h
+3
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@@ -65,6 +65,9 @@
#define param_set_arc_max_args(var) \
CTLTYPE_U64, NULL, 0, param_set_arc_max, "QU"
#define param_set_l2arc_dwpd_limit_args(var) \
CTLTYPE_U64, &var, 0, param_set_l2arc_dwpd_limit, "QU"
#define param_set_arc_free_target_args(var) \
CTLTYPE_UINT, NULL, 0, param_set_arc_free_target, "IU"