diff --git a/man/man5/zfs-module-parameters.5 b/man/man5/zfs-module-parameters.5
index c0365ea5c9cd..de3f35bbb80d 100644
--- a/man/man5/zfs-module-parameters.5
+++ b/man/man5/zfs-module-parameters.5
@@ -385,6 +385,18 @@ Seconds before growing arc size
 Default value: \fB5\fR.
 .RE
 
+.sp
+.ne 2
+.na
+\fBzfs_arc_lotsfree_percent\fR (int)
+.ad
+.RS 12n
+Throttle I/O when free system memory drops below this percentage of total
+system memory.  Setting this value to 0 will disable the throttle.
+.sp
+Default value: \fB10\fR.
+.RE
+
 .sp
 .ne 2
 .na
@@ -396,17 +408,6 @@ Max arc size
 Default value: \fB0\fR.
 .RE
 
-.sp
-.ne 2
-.na
-\fBzfs_arc_memory_throttle_disable\fR (int)
-.ad
-.RS 12n
-Disable memory throttle
-.sp
-Use \fB1\fR for yes (default) and \fB0\fR to disable.
-.RE
-
 .sp
 .ne 2
 .na
diff --git a/module/zfs/arc.c b/module/zfs/arc.c
index 97bfb2c2510c..00d9890288aa 100644
--- a/module/zfs/arc.c
+++ b/module/zfs/arc.c
@@ -241,13 +241,13 @@ int zfs_arc_average_blocksize = 8 * 1024; /* 8KB */
  * These tunables are Linux specific
  */
 unsigned long zfs_arc_sys_free = 0;
-int zfs_arc_memory_throttle_disable = 1;
 int zfs_arc_min_prefetch_lifespan = 0;
 int zfs_arc_p_aggressive_disable = 1;
 int zfs_arc_p_dampener_disable = 1;
 int zfs_arc_meta_prune = 10000;
 int zfs_arc_meta_strategy = ARC_STRATEGY_META_BALANCED;
 int zfs_arc_meta_adjust_restarts = 4096;
+int zfs_arc_lotsfree_percent = 10;
 
 /* The 6 states: */
 static arc_state_t ARC_anon;
@@ -5064,18 +5064,41 @@ static int
 arc_memory_throttle(uint64_t reserve, uint64_t txg)
 {
 #ifdef _KERNEL
-	if (zfs_arc_memory_throttle_disable)
-		return (0);
+	uint64_t available_memory = ptob(freemem);
+	static uint64_t page_load = 0;
+	static uint64_t last_txg = 0;
+#ifdef __linux__
+	pgcnt_t minfree = btop(arc_sys_free / 4);
+#endif
 
 	if (freemem > physmem * arc_lotsfree_percent / 100)
 		return (0);
 
-	if (arc_reclaim_needed()) {
+	if (txg > last_txg) {
+		last_txg = txg;
+		page_load = 0;
+	}
+
+	/*
+	 * If we are in pageout, we know that memory is already tight,
+	 * the arc is already going to be evicting, so we just want to
+	 * continue to let page writes occur as quickly as possible.
+	 */
+	if (current_is_kswapd()) {
+		if (page_load > MAX(ptob(minfree), available_memory) / 4) {
+			DMU_TX_STAT_BUMP(dmu_tx_memory_reclaim);
+			return (SET_ERROR(ERESTART));
+		}
+		/* Note: reserve is inflated, so we deflate */
+		page_load += reserve / 8;
+		return (0);
+	} else if (page_load > 0 && arc_reclaim_needed()) {
 		/* memory is low, delay before restarting */
 		ARCSTAT_INCR(arcstat_memory_throttle_count, 1);
 		DMU_TX_STAT_BUMP(dmu_tx_memory_reclaim);
 		return (SET_ERROR(EAGAIN));
 	}
+	page_load = 0;
 #endif
 	return (0);
 }
@@ -5280,9 +5303,15 @@ arc_tuning_update(void)
 	if (zfs_arc_min_prefetch_lifespan)
 		arc_min_prefetch_lifespan = zfs_arc_min_prefetch_lifespan;
 
+	/* Valid range: 0 - 100 */
+	if ((zfs_arc_lotsfree_percent >= 0) &&
+	    (zfs_arc_lotsfree_percent <= 100))
+		arc_lotsfree_percent = zfs_arc_lotsfree_percent;
+
 	/* Valid range: 0 - <all physical memory> */
 	if ((zfs_arc_sys_free) && (zfs_arc_sys_free != arc_sys_free))
 		arc_sys_free = MIN(MAX(zfs_arc_sys_free, 0), ptob(physmem));
+
 }
 
 void
@@ -7023,9 +7052,6 @@ MODULE_PARM_DESC(zfs_disable_dup_eviction, "disable duplicate buffer eviction");
 module_param(zfs_arc_average_blocksize, int, 0444);
 MODULE_PARM_DESC(zfs_arc_average_blocksize, "Target average block size");
 
-module_param(zfs_arc_memory_throttle_disable, int, 0644);
-MODULE_PARM_DESC(zfs_arc_memory_throttle_disable, "disable memory throttle");
-
 module_param(zfs_arc_min_prefetch_lifespan, int, 0644);
 MODULE_PARM_DESC(zfs_arc_min_prefetch_lifespan, "Min life of prefetch block");
 
@@ -7063,6 +7089,10 @@ MODULE_PARM_DESC(l2arc_feed_again, "Turbo L2ARC warmup");
 module_param(l2arc_norw, int, 0644);
 MODULE_PARM_DESC(l2arc_norw, "No reads during writes");
 
+module_param(zfs_arc_lotsfree_percent, int, 0644);
+MODULE_PARM_DESC(zfs_arc_lotsfree_percent,
+	"System free memory I/O throttle in bytes");
+
 module_param(zfs_arc_sys_free, ulong, 0644);
 MODULE_PARM_DESC(zfs_arc_sys_free, "System free memory target size in bytes");