diff --git a/tests/zfs-tests/include/tunables.cfg b/tests/zfs-tests/include/tunables.cfg
index a619b846dd..82a7cac76a 100644
--- a/tests/zfs-tests/include/tunables.cfg
+++ b/tests/zfs-tests/include/tunables.cfg
@@ -68,6 +68,7 @@ REBUILD_SCRUB_ENABLED		rebuild_scrub_enabled		zfs_rebuild_scrub_enabled
 REMOVAL_SUSPEND_PROGRESS	removal_suspend_progress	zfs_removal_suspend_progress
 REMOVE_MAX_SEGMENT		remove_max_segment		zfs_remove_max_segment
 RESILVER_MIN_TIME_MS		resilver_min_time_ms		zfs_resilver_min_time_ms
+RESILVER_DEFER_PERCENT		resilver_defer_percent		zfs_resilver_defer_percent
 SCAN_LEGACY			scan_legacy			zfs_scan_legacy
 SCAN_SUSPEND_PROGRESS		scan_suspend_progress		zfs_scan_suspend_progress
 SCAN_VDEV_LIMIT			scan_vdev_limit			zfs_scan_vdev_limit
diff --git a/tests/zfs-tests/tests/functional/replacement/resilver_restart_001.ksh b/tests/zfs-tests/tests/functional/replacement/resilver_restart_001.ksh
index b498ba4af7..629870adf9 100755
--- a/tests/zfs-tests/tests/functional/replacement/resilver_restart_001.ksh
+++ b/tests/zfs-tests/tests/functional/replacement/resilver_restart_001.ksh
@@ -96,6 +96,8 @@ set -A RESTARTS -- '1' '2' '2' '2'
 set -A VDEVS -- '' '' '' ''
 set -A DEFER_RESTARTS -- '1' '1' '1' '2'
 set -A DEFER_VDEVS -- '-' '2' '2' '-'
+set -A EARLY_RESTART_DEFER_RESTARTS -- '1' '2' '2' '2'
+set -A EARLY_RESTART_DEFER_VDEVS -- '' '' '' ''
 
 VDEV_REPLACE="${VDEV_FILES[1]} $SPARE_VDEV_FILE"
 
@@ -125,7 +127,7 @@ done
 wait
 
 # test without and with deferred resilve feature enabled
-for test in "without" "with"
+for test in "without" "with" "with_early_restart"
 do
 	log_note "Testing $test deferred resilvers"
 
@@ -135,6 +137,13 @@ do
 		RESTARTS=( "${DEFER_RESTARTS[@]}" )
 		VDEVS=( "${DEFER_VDEVS[@]}" )
 		VDEV_REPLACE="$SPARE_VDEV_FILE ${VDEV_FILES[1]}"
+		log_must set_tunable32 RESILVER_DEFER_PERCENT 0
+	elif [[ $test == "with_early_restart" ]]
+	then
+		RESTARTS=( "${EARLY_RESTART_DEFER_RESTARTS[@]}" )
+		VDEVS=( "${EARLY_RESTART_DEFER_VDEVS[@]}" )
+		VDEV_REPLACE="${VDEV_FILES[1]} $SPARE_VDEV_FILE"
+		log_must set_tunable32 RESILVER_DEFER_PERCENT 100
 	fi
 
 	# clear the events