diff --git a/sys/arch/alpha/alpha/machdep.c b/sys/arch/alpha/alpha/machdep.c
index a201f83d3095..5b41c81e87ce 100644
--- a/sys/arch/alpha/alpha/machdep.c
+++ b/sys/arch/alpha/alpha/machdep.c
@@ -1,4 +1,4 @@
-/* $NetBSD: machdep.c,v 1.163 1999/03/24 05:50:51 mrg Exp $ */
+/* $NetBSD: machdep.c,v 1.164 1999/03/26 00:15:04 thorpej Exp $ */
 
 /*-
  * Copyright (c) 1998 The NetBSD Foundation, Inc.
@@ -82,7 +82,7 @@
 
 #include <sys/cdefs.h>			/* RCS ID & Copyright macro defns */
 
-__KERNEL_RCSID(0, "$NetBSD: machdep.c,v 1.163 1999/03/24 05:50:51 mrg Exp $");
+__KERNEL_RCSID(0, "$NetBSD: machdep.c,v 1.164 1999/03/26 00:15:04 thorpej Exp $");
 
 #include <sys/param.h>
 #include <sys/systm.h>
@@ -261,7 +261,6 @@ u_int8_t	dec_3000_scsiid[2], dec_3000_scsifast[2];
 
 struct platform platform;
 
-u_int32_t vm_mbuf_size = _VM_MBUF_SIZE;
 u_int32_t vm_kmem_size = _VM_KMEM_SIZE;
 u_int32_t vm_phys_size = _VM_PHYS_SIZE;
 
@@ -717,7 +716,6 @@ nobootinfo:
 	 * It's for booting a GENERIC kernel on a large memory platform.
 	 */
 	if (physmem >= atop(128 * 1024 * 1024)) {
-		vm_mbuf_size <<= 1;
 		vm_kmem_size <<= 3;
 		vm_phys_size <<= 2;
 	}
@@ -1086,10 +1084,11 @@ cpu_startup()
 				   VM_PHYS_SIZE, TRUE, FALSE, NULL);
 
 	/*
-	 * Finally, allocate mbuf cluster submap.
+	 * No need to allocate an mbuf cluster submap.  Mbuf clusters
+	 * are allocated via the pool allocator, and we use K0SEG to
+	 * map those pages.
 	 */
-	mb_map = uvm_km_suballoc(kernel_map, &minaddr, &maxaddr,
-				 VM_MBUF_SIZE, FALSE, FALSE, NULL);
+
 	/*
 	 * Initialize callouts
 	 */
diff --git a/sys/arch/alpha/alpha/pmap.c b/sys/arch/alpha/alpha/pmap.c
index 7386d8b63de5..22a432104b9b 100644
--- a/sys/arch/alpha/alpha/pmap.c
+++ b/sys/arch/alpha/alpha/pmap.c
@@ -1,4 +1,4 @@
-/* $NetBSD: pmap.c,v 1.84 1999/03/24 05:50:51 mrg Exp $ */
+/* $NetBSD: pmap.c,v 1.85 1999/03/26 00:15:04 thorpej Exp $ */
 
 /*-
  * Copyright (c) 1998, 1999 The NetBSD Foundation, Inc.
@@ -155,7 +155,7 @@
 
 #include <sys/cdefs.h>			/* RCS ID & Copyright macro defns */
 
-__KERNEL_RCSID(0, "$NetBSD: pmap.c,v 1.84 1999/03/24 05:50:51 mrg Exp $");
+__KERNEL_RCSID(0, "$NetBSD: pmap.c,v 1.85 1999/03/26 00:15:04 thorpej Exp $");
 
 #include <sys/param.h>
 #include <sys/systm.h>
@@ -731,7 +731,7 @@ pmap_bootstrap(ptaddr, maxasn, ncpuids)
 	 * This should be kept in sync.
 	 * We also reserve space for kmem_alloc_pageable() for vm_fork().
 	 */
-	lev3mapsize = (VM_KMEM_SIZE + VM_MBUF_SIZE + VM_PHYS_SIZE +
+	lev3mapsize = (VM_KMEM_SIZE + VM_PHYS_SIZE +
 		nbuf * MAXBSIZE + 16 * NCARGS) / NBPG + 512 +
 		(maxproc * UPAGES);
 
diff --git a/sys/arch/alpha/include/vmparam.h b/sys/arch/alpha/include/vmparam.h
index 3f316ef5913d..74f5f503798f 100644
--- a/sys/arch/alpha/include/vmparam.h
+++ b/sys/arch/alpha/include/vmparam.h
@@ -1,4 +1,4 @@
-/* $NetBSD: vmparam.h,v 1.13 1999/01/16 20:04:22 chuck Exp $ */
+/* $NetBSD: vmparam.h,v 1.14 1999/03/26 00:15:05 thorpej Exp $ */
 
 /*
  * Copyright (c) 1988 University of Utah.
@@ -144,17 +144,14 @@
 #define VM_MAX_KERNEL_ADDRESS	((vaddr_t)ALPHA_K1SEG_END)
 
 /* virtual sizes (bytes) for various kernel submaps */
-#define _VM_MBUF_SIZE		(NMBCLUSTERS*MCLBYTES)
 #define _VM_KMEM_SIZE		(NKMEMCLUSTERS*CLBYTES)
 #define _VM_PHYS_SIZE		(USRIOSIZE*CLBYTES)
 
 #ifndef	_KERNEL
-#define VM_MBUF_SIZE		_VM_MBUF_SIZE
 #define VM_KMEM_SIZE		_VM_KMEM_SIZE
 #define VM_PHYS_SIZE		_VM_PHYS_SIZE
 #else
-extern u_int32_t vm_mbuf_size, vm_kmem_size, vm_phys_size;
-#define VM_MBUF_SIZE		vm_mbuf_size
+extern u_int32_t vm_kmem_size, vm_phys_size;
 #define VM_KMEM_SIZE		vm_kmem_size
 #define VM_PHYS_SIZE		vm_phys_size
 #endif /* _KERNEL */
diff --git a/sys/arch/mips/include/vmparam.h b/sys/arch/mips/include/vmparam.h
index 3f65e183b101..124768efc10d 100644
--- a/sys/arch/mips/include/vmparam.h
+++ b/sys/arch/mips/include/vmparam.h
@@ -1,4 +1,4 @@
-/*	$NetBSD: vmparam.h,v 1.13 1999/01/18 03:48:34 nisimura Exp $	*/
+/*	$NetBSD: vmparam.h,v 1.14 1999/03/26 00:15:05 thorpej Exp $	*/
 
 /*
  * Copyright (c) 1988 University of Utah.
@@ -137,7 +137,6 @@
 #define VM_MAX_KERNEL_ADDRESS	((vaddr_t)0xFFFFC000)
 
 /* virtual sizes (bytes) for various kernel submaps */
-#define VM_MBUF_SIZE		(NMBCLUSTERS*MCLBYTES)
 #define VM_KMEM_SIZE		(NKMEMCLUSTERS*CLBYTES)
 #define VM_PHYS_SIZE		(USRIOSIZE*CLBYTES)
 
diff --git a/sys/arch/mips/mips/pmap.c b/sys/arch/mips/mips/pmap.c
index 23ad54b6610f..e3e62d2ff164 100644
--- a/sys/arch/mips/mips/pmap.c
+++ b/sys/arch/mips/mips/pmap.c
@@ -1,4 +1,4 @@
-/*	$NetBSD: pmap.c,v 1.53 1999/03/24 05:51:05 mrg Exp $	*/
+/*	$NetBSD: pmap.c,v 1.54 1999/03/26 00:15:05 thorpej Exp $	*/
 
 /*-
  * Copyright (c) 1998 The NetBSD Foundation, Inc.
@@ -78,7 +78,7 @@
 
 #include <sys/cdefs.h>
 
-__KERNEL_RCSID(0, "$NetBSD: pmap.c,v 1.53 1999/03/24 05:51:05 mrg Exp $");
+__KERNEL_RCSID(0, "$NetBSD: pmap.c,v 1.54 1999/03/26 00:15:05 thorpej Exp $");
 
 /*
  *	Manages physical address maps.
@@ -265,7 +265,7 @@ pmap_bootstrap()
 	 * Allocate a PTE table for the kernel.
 	 * We also reserve space for kmem_alloc_pageable() for vm_fork().
 	 */
-	Sysmapsize = (VM_KMEM_SIZE + VM_MBUF_SIZE + VM_PHYS_SIZE +
+	Sysmapsize = (VM_KMEM_SIZE + VM_PHYS_SIZE +
 		nbuf * MAXBSIZE + 16 * NCARGS) / NBPG;
 	/*
 	 * Allocate PTE space space for u-areas (XXX)
diff --git a/sys/arch/newsmips/newsmips/machdep.c b/sys/arch/newsmips/newsmips/machdep.c
index 841820004cd6..d1d23fd9902f 100644
--- a/sys/arch/newsmips/newsmips/machdep.c
+++ b/sys/arch/newsmips/newsmips/machdep.c
@@ -1,4 +1,4 @@
-/*	$NetBSD: machdep.c,v 1.20 1999/03/24 05:51:07 mrg Exp $	*/
+/*	$NetBSD: machdep.c,v 1.21 1999/03/26 00:15:05 thorpej Exp $	*/
 
 /*
  * Copyright (c) 1988 University of Utah.
@@ -43,7 +43,7 @@
 
 #include <sys/cdefs.h>			/* RCS ID & Copyright macro defns */
 
-__KERNEL_RCSID(0, "$NetBSD: machdep.c,v 1.20 1999/03/24 05:51:07 mrg Exp $");
+__KERNEL_RCSID(0, "$NetBSD: machdep.c,v 1.21 1999/03/26 00:15:05 thorpej Exp $");
 
 /* from: Utah Hdr: machdep.c 1.63 91/04/24 */
 
@@ -399,10 +399,11 @@ cpu_startup()
 				   VM_PHYS_SIZE, TRUE, FALSE, NULL);
 
 	/*
-	 * Finally, allocate mbuf cluster submap.
+	 * No need to allocate an mbuf cluster submap.  Mbuf clusters
+	 * are allocated via the pool allocator, and we use KSEG to
+	 * map those pages.
 	 */
-	mb_map = uvm_km_suballoc(kernel_map, &minaddr, &maxaddr,
-			         VM_MBUF_SIZE, FALSE, FALSE, NULL);
+
 	/*
 	 * Initialize callouts
 	 */
diff --git a/sys/arch/pmax/pmax/machdep.c b/sys/arch/pmax/pmax/machdep.c
index 3ad7283aa634..01fa856324d7 100644
--- a/sys/arch/pmax/pmax/machdep.c
+++ b/sys/arch/pmax/pmax/machdep.c
@@ -1,4 +1,4 @@
-/*	$NetBSD: machdep.c,v 1.130 1999/03/25 01:17:53 simonb Exp $	*/
+/*	$NetBSD: machdep.c,v 1.131 1999/03/26 00:15:05 thorpej Exp $	*/
 
 /*
  * Copyright (c) 1988 University of Utah.
@@ -43,7 +43,7 @@
 
 #include <sys/cdefs.h>			/* RCS ID & Copyright macro defns */
 
-__KERNEL_RCSID(0, "$NetBSD: machdep.c,v 1.130 1999/03/25 01:17:53 simonb Exp $");
+__KERNEL_RCSID(0, "$NetBSD: machdep.c,v 1.131 1999/03/26 00:15:05 thorpej Exp $");
 
 /* from: Utah Hdr: machdep.c 1.63 91/04/24 */
 
@@ -590,10 +590,10 @@ cpu_startup()
 				   VM_PHYS_SIZE, TRUE, FALSE, NULL);
 
 	/*
-	 * Finally, allocate mbuf cluster submap.
+	 * No need to allocate an mbuf cluster submap.  Mbuf clusters
+	 * are allocated via the pool allocator, and we use KSEG to
+	 * map those pages.
 	 */
-	mb_map = uvm_km_suballoc(kernel_map, &minaddr, &maxaddr,
-			         VM_MBUF_SIZE, FALSE, FALSE, NULL);
 
 	/*
 	 * Initialize callouts