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Reduce minimal scrub/resilver times

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With higher throughput and lower latency of modern devices ZFS can
happily live with pretty short (fractions of a second) TXGs.  But
the two decade old multi-second minimal time limits can almost stop
payload writes by extending TXGs beyond dirty data limits of ARC
ability to amortize it.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Alexander Motin <alexander.motin@TrueNAS.com>
Closes #18060
This commit is contained in:
Alexander Motin
2025-12-18 13:21:45 -05:00
committed by GitHub
parent 1d43387dd8
commit a83bb15fcd
2 changed files with 4 additions and 4 deletions
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4
man/man4/zfs.4
View File

@@ -2116,7 +2116,7 @@ even if the
.Sy resilver_defer
feature is enabled.
.
.It Sy zfs_resilver_min_time_ms Ns = Ns Sy 3000 Ns ms Po 3 s Pc Pq uint
.It Sy zfs_resilver_min_time_ms Ns = Ns Sy 1500 Ns ms Pq uint
Resilvers are processed by the sync thread.
While resilvering, it will spend at least this much time
working on a resilver between TXG flushes.
@@ -2133,7 +2133,7 @@ in order to verify the checksums of all blocks which have been
copied during the expansion.
This is enabled by default and strongly recommended.
.
.It Sy zfs_scrub_min_time_ms Ns = Ns Sy 1000 Ns ms Po 1 s Pc Pq uint
.It Sy zfs_scrub_min_time_ms Ns = Ns Sy 750 Ns ms Pq uint
Scrubs are processed by the sync thread.
While scrubbing, it will spend at least this much time
working on a scrub between TXG flushes.

4
module/zfs/dsl_scan.c
View File

@@ -189,7 +189,7 @@ static uint_t zfs_scan_mem_lim_fact = 20;
static uint_t zfs_scan_mem_lim_soft_fact = 20;
/* minimum milliseconds to scrub per txg */
static uint_t zfs_scrub_min_time_ms = 1000;
static uint_t zfs_scrub_min_time_ms = 750;
/* minimum milliseconds to obsolete per txg */
static uint_t zfs_obsolete_min_time_ms = 500;
@@ -198,7 +198,7 @@ static uint_t zfs_obsolete_min_time_ms = 500;
static uint_t zfs_free_min_time_ms = 500;
/* minimum milliseconds to resilver per txg */
static uint_t zfs_resilver_min_time_ms = 3000;
static uint_t zfs_resilver_min_time_ms = 1500;
static uint_t zfs_scan_checkpoint_intval = 7200; /* in seconds */
int zfs_scan_suspend_progress = 0; /* set to prevent scans from progressing */