diff --git a/mm/iob/Kconfig b/mm/iob/Kconfig
index bd5875b961..d39c6c4dad 100644
--- a/mm/iob/Kconfig
+++ b/mm/iob/Kconfig
@@ -71,6 +71,20 @@ config IOB_NOTIFIER
 		support poll() logic where the poll must wait for an IOB to become
 		available.
 
+config IOB_NOTIFIER_DIV
+	int "Notification divider"
+	default 4
+	range 1 64
+	depends on IOB_NOTIFIER
+	---help---
+		IOBs may become available at very high rates and the resulting
+		notification processing can be substantial even if there is nothing
+		waiting for a free IOB.  This divider will reduce that rate of
+		notification.  This must be an even power of two.  Supported values
+		include:  1, 2, 4, 8, 16, 32, 64.  The default value of 4 means that
+		a notification will be sent only when there are a multiple of 4 IOBs
+		available.
+
 config IOB_DEBUG
 	bool "Force I/O buffer debug"
 	default n
diff --git a/mm/iob/iob_free.c b/mm/iob/iob_free.c
index b29dafe610..980f43df4a 100644
--- a/mm/iob/iob_free.c
+++ b/mm/iob/iob_free.c
@@ -50,6 +50,28 @@
 
 #include "iob.h"
 
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+#if !defined(CONFIG_IOB_NOTIFIER_DIV) || CONFIG_IOB_NOTIFIER_DIV < 2
+#  define IOB_DIVIDER 1
+#elif CONFIG_IOB_NOTIFIER_DIV < 4
+#  define IOB_DIVIDER 2
+#elif CONFIG_IOB_NOTIFIER_DIV < 8
+#  define IOB_DIVIDER 4
+#elif CONFIG_IOB_NOTIFIER_DIV < 16
+#  define IOB_DIVIDER 8
+#elif CONFIG_IOB_NOTIFIER_DIV < 32
+#  define IOB_DIVIDER 16
+#elif CONFIG_IOB_NOTIFIER_DIV < 64
+#  define IOB_DIVIDER 32
+#else
+#  define IOB_DIVIDER 64
+#endif
+
+#define IOB_MASK      (IOB_DIVIDER - 1)
+
 /****************************************************************************
  * Public Functions
  ****************************************************************************/
@@ -67,6 +89,9 @@ FAR struct iob_s *iob_free(FAR struct iob_s *iob)
 {
   FAR struct iob_s *next = iob->io_flink;
   irqstate_t flags;
+#ifdef CONFIG_IOB_NOTIFIER
+  int16_t navail;
+#endif
 
   iobinfo("iob=%p io_pktlen=%u io_len=%u next=%p\n",
           iob, iob->io_pktlen, iob->io_len, next);
@@ -149,7 +174,8 @@ FAR struct iob_s *iob_free(FAR struct iob_s *iob)
    * for an IOB.
    */
 
-  if (iob_navail(false) > 0)
+  navail = iob_navail(false);
+  if (navail > 0 && (navail & IOB_MASK) == 0)
     {
       /* Signal any threads that have requested a signal notification
        * when an IOB becomes available.