2 files changed, 22 insertions, 3 deletions

diff --git a/sys/kern/subr_mbuf.c b/sys/kern/subr_mbuf.c
index 596319d091c2..7c4ab83d0f66 100644
--- a/sys/kern/subr_mbuf.c
+++ b/sys/kern/subr_mbuf.c
@@ -621,9 +621,22 @@ mb_alloc(struct mb_lstmngr *mb_list, int how, short type)
 				   * steal from other lists.
 				   */
 					m = mb_alloc_wait(mb_list, type);
-				} else
+				} else {
+					/*
+					 * no way to indent this code decently
+					 * with 8-space tabs.
+					 */
+					static int last_report;
 					/* XXX: No consistency. */
 					mbstat.m_drops++;
+					if (ticks < last_report ||
+					   (ticks - last_report) >= hz) {
+						last_report = ticks;
+						printf(
+"mb_alloc for type %d failed, consider increase mbuf value.\n", type);
+					}
+
+				}
 			}
 		}
 	}
diff --git a/sys/vm/vm_kern.c b/sys/vm/vm_kern.c
index 7ab7c08d783c..2e5ea304a627 100644
--- a/sys/vm/vm_kern.c
+++ b/sys/vm/vm_kern.c
@@ -70,6 +70,7 @@
 
 #include <sys/param.h>
 #include <sys/systm.h>
+#include <sys/kernel.h>		/* for ticks and hz */
 #include <sys/lock.h>
 #include <sys/mutex.h>
 #include <sys/proc.h>
@@ -331,8 +332,13 @@ kmem_malloc(map, size, flags)
 	if (vm_map_findspace(map, vm_map_min(map), size, &addr)) {
 		vm_map_unlock(map);
 		if (map != kmem_map) {
-			printf("Out of mbuf address space!\n");
-			printf("Consider increasing NMBCLUSTERS\n");
+			static int last_report; /* when we did it (in ticks) */
+			if (ticks < last_report ||
+			    (ticks - last_report) >= hz) {
+				last_report = ticks;
+				printf("Out of mbuf address space!\n");
+				printf("Consider increasing NMBCLUSTERS\n");
+			}
 			goto bad;
 		}
 		if ((flags & M_NOWAIT) == 0)