svn commit: r254515 - in stable/9/sys: i386/include kern sys
Andre Oppermann
andre at FreeBSD.org
Mon Aug 19 09:49:53 UTC 2013
Author: andre
Date: Mon Aug 19 09:49:51 2013
New Revision: 254515
URL: http://svnweb.freebsd.org/changeset/base/254515
Log:
MFC a bundle of commits that bring autotuning to mbufs, maxfiles/sockets
and maxusers to the 9-stable branch. It is committed as bundle because
these patches build on each other and only provide the functionality in
their entirety. Some are bug fixes to aspects of earlier commits.
MFC r242029 (alfred):
Allow autotune maxusers > 384 on 64 bit machines.
MFC r242847 (alfred):
Allow maxusers to scale on machines with large address space.
MFC r243631 (andre):
Base the mbuf related limits on the available physical memory or
kernel memory, whichever is lower. The overall mbuf related memory
limit must be set so that mbufs (and clusters of various sizes)
can't exhaust physical RAM or KVM.
At the same time divorce maxfiles from maxusers and set maxfiles to
physpages / 8 with a floor based on maxusers. This way busy servers
can make use of the significantly increased mbuf limits with a much
larger number of open sockets.
MFC r243639 (andre):
Complete r243631 by applying the remainder of kern_mbuf.c that got
lost while merging into the commit tree.
MFC r243668 (andre):
Using a long is the wrong type to represent the realmem and maxmbufmem
variable as they may overflow on i386/PAE and i386 with > 2GB RAM.
MFC r243995, r243996, r243997 (pjd):
Style cleanups, Make use of the fact that uma_zone_set_max(9) already
returns actual limit set.
MFC r244080 (andre):
Prevent long type overflow of realmem calculation on ILP32 by forcing
calculation to be in quad_t space. Fix style issue with second parameter
to qmin().
MFC r245469 (alfred):
Do not autotune ncallout to be greater than 18508.
MFC r245575 (andre):
Move the mbuf memory limit calculations from init_param2() to
tunable_mbinit() where it is next to where it is used later.
MFC r246207 (andre):
Remove unused VM_MAX_AUTOTUNE_NMBCLUSTERS define.
MFC r249843 (andre):
Base the calculation of maxmbufmem in part on kmem_map size
instead of kernel_map size to prevent kernel memory exhaustion
by mbufs and a subsequent panic on physical page allocation
failure.
MFC r253204 (andre):
Fix style issues, a typo in "kern.ipc.nmbufs" and correctly plave and
expose the value of the tunable maxmbufmem as "kern.ipc.maxmbufmem"
through sysctl.
MFC r253207 (andre):
Make use of the fact that uma_zone_set_max(9) already returns the
rounded limit making a call to uma_zone_get_max(9) unnecessary.
Tested by: alfred (iXsystems)
Modified:
stable/9/sys/i386/include/vmparam.h
stable/9/sys/kern/kern_mbuf.c
stable/9/sys/kern/subr_param.c
stable/9/sys/kern/uipc_socket.c
stable/9/sys/sys/eventhandler.h
stable/9/sys/sys/mbuf.h
Directory Properties:
stable/9/sys/ (props changed)
stable/9/sys/sys/ (props changed)
Modified: stable/9/sys/i386/include/vmparam.h
==============================================================================
--- stable/9/sys/i386/include/vmparam.h Mon Aug 19 08:28:35 2013 (r254514)
+++ stable/9/sys/i386/include/vmparam.h Mon Aug 19 09:49:51 2013 (r254515)
@@ -202,4 +202,8 @@
#define ZERO_REGION_SIZE (64 * 1024) /* 64KB */
+#ifndef VM_MAX_AUTOTUNE_MAXUSERS
+#define VM_MAX_AUTOTUNE_MAXUSERS 384
+#endif
+
#endif /* _MACHINE_VMPARAM_H_ */
Modified: stable/9/sys/kern/kern_mbuf.c
==============================================================================
--- stable/9/sys/kern/kern_mbuf.c Mon Aug 19 08:28:35 2013 (r254514)
+++ stable/9/sys/kern/kern_mbuf.c Mon Aug 19 09:49:51 2013 (r254515)
@@ -1,6 +1,6 @@
/*-
* Copyright (c) 2004, 2005,
- * Bosko Milekic <bmilekic at FreeBSD.org>. All rights reserved.
+ * Bosko Milekic <bmilekic at FreeBSD.org>. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
@@ -47,6 +47,7 @@ __FBSDID("$FreeBSD$");
#include <vm/vm_extern.h>
#include <vm/vm_kern.h>
#include <vm/vm_page.h>
+#include <vm/vm_map.h>
#include <vm/uma.h>
#include <vm/uma_int.h>
#include <vm/uma_dbg.h>
@@ -76,7 +77,7 @@ __FBSDID("$FreeBSD$");
* [ Cluster Zone ] [ Zone ] [ Mbuf Master Zone ]
* | \________ |
* [ Cluster Keg ] \ /
- * | [ Mbuf Keg ]
+ * | [ Mbuf Keg ]
* [ Cluster Slabs ] |
* | [ Mbuf Slabs ]
* \____________(VM)_________________/
@@ -96,39 +97,64 @@ __FBSDID("$FreeBSD$");
*
*/
+int nmbufs; /* limits number of mbufs */
int nmbclusters; /* limits number of mbuf clusters */
int nmbjumbop; /* limits number of page size jumbo clusters */
int nmbjumbo9; /* limits number of 9k jumbo clusters */
int nmbjumbo16; /* limits number of 16k jumbo clusters */
struct mbstat mbstat;
+static quad_t maxmbufmem; /* overall real memory limit for all mbufs */
+
+SYSCTL_QUAD(_kern_ipc, OID_AUTO, maxmbufmem, CTLFLAG_RDTUN, &maxmbufmem, 0,
+ "Maximum real memory allocateable to various mbuf types");
+
/*
- * tunable_mbinit() has to be run before init_maxsockets() thus
- * the SYSINIT order below is SI_ORDER_MIDDLE while init_maxsockets()
- * runs at SI_ORDER_ANY.
+ * tunable_mbinit() has to be run before any mbuf allocations are done.
*/
static void
tunable_mbinit(void *dummy)
{
+ quad_t realmem;
+
+ /*
+ * The default limit for all mbuf related memory is 1/2 of all
+ * available kernel memory (physical or kmem).
+ * At most it can be 3/4 of available kernel memory.
+ */
+ realmem = qmin((quad_t)physmem * PAGE_SIZE,
+ vm_map_max(kmem_map) - vm_map_min(kmem_map));
+ maxmbufmem = realmem / 2;
+ TUNABLE_QUAD_FETCH("kern.ipc.maxmbufmem", &maxmbufmem);
+ if (maxmbufmem > realmem / 4 * 3)
+ maxmbufmem = realmem / 4 * 3;
- /* This has to be done before VM init. */
TUNABLE_INT_FETCH("kern.ipc.nmbclusters", &nmbclusters);
if (nmbclusters == 0)
- nmbclusters = 1024 + maxusers * 64;
+ nmbclusters = maxmbufmem / MCLBYTES / 4;
TUNABLE_INT_FETCH("kern.ipc.nmbjumbop", &nmbjumbop);
if (nmbjumbop == 0)
- nmbjumbop = nmbclusters / 2;
+ nmbjumbop = maxmbufmem / MJUMPAGESIZE / 4;
TUNABLE_INT_FETCH("kern.ipc.nmbjumbo9", &nmbjumbo9);
if (nmbjumbo9 == 0)
- nmbjumbo9 = nmbclusters / 4;
+ nmbjumbo9 = maxmbufmem / MJUM9BYTES / 6;
TUNABLE_INT_FETCH("kern.ipc.nmbjumbo16", &nmbjumbo16);
if (nmbjumbo16 == 0)
- nmbjumbo16 = nmbclusters / 8;
+ nmbjumbo16 = maxmbufmem / MJUM16BYTES / 6;
+
+ /*
+ * We need at least as many mbufs as we have clusters of
+ * the various types added together.
+ */
+ TUNABLE_INT_FETCH("kern.ipc.nmbufs", &nmbufs);
+ if (nmbufs < nmbclusters + nmbjumbop + nmbjumbo9 + nmbjumbo16)
+ nmbufs = lmax(maxmbufmem / MSIZE / 5,
+ nmbclusters + nmbjumbop + nmbjumbo9 + nmbjumbo16);
}
-SYSINIT(tunable_mbinit, SI_SUB_TUNABLES, SI_ORDER_MIDDLE, tunable_mbinit, NULL);
+SYSINIT(tunable_mbinit, SI_SUB_KMEM, SI_ORDER_MIDDLE, tunable_mbinit, NULL);
static int
sysctl_nmbclusters(SYSCTL_HANDLER_ARGS)
@@ -136,11 +162,12 @@ sysctl_nmbclusters(SYSCTL_HANDLER_ARGS)
int error, newnmbclusters;
newnmbclusters = nmbclusters;
- error = sysctl_handle_int(oidp, &newnmbclusters, 0, req);
+ error = sysctl_handle_int(oidp, &newnmbclusters, 0, req);
if (error == 0 && req->newptr) {
- if (newnmbclusters > nmbclusters) {
+ if (newnmbclusters > nmbclusters &&
+ nmbufs >= nmbclusters + nmbjumbop + nmbjumbo9 + nmbjumbo16) {
nmbclusters = newnmbclusters;
- uma_zone_set_max(zone_clust, nmbclusters);
+ nmbclusters = uma_zone_set_max(zone_clust, nmbclusters);
EVENTHANDLER_INVOKE(nmbclusters_change);
} else
error = EINVAL;
@@ -157,11 +184,12 @@ sysctl_nmbjumbop(SYSCTL_HANDLER_ARGS)
int error, newnmbjumbop;
newnmbjumbop = nmbjumbop;
- error = sysctl_handle_int(oidp, &newnmbjumbop, 0, req);
+ error = sysctl_handle_int(oidp, &newnmbjumbop, 0, req);
if (error == 0 && req->newptr) {
- if (newnmbjumbop> nmbjumbop) {
+ if (newnmbjumbop > nmbjumbop &&
+ nmbufs >= nmbclusters + nmbjumbop + nmbjumbo9 + nmbjumbo16) {
nmbjumbop = newnmbjumbop;
- uma_zone_set_max(zone_jumbop, nmbjumbop);
+ nmbjumbop = uma_zone_set_max(zone_jumbop, nmbjumbop);
} else
error = EINVAL;
}
@@ -169,8 +197,7 @@ sysctl_nmbjumbop(SYSCTL_HANDLER_ARGS)
}
SYSCTL_PROC(_kern_ipc, OID_AUTO, nmbjumbop, CTLTYPE_INT|CTLFLAG_RW,
&nmbjumbop, 0, sysctl_nmbjumbop, "IU",
- "Maximum number of mbuf page size jumbo clusters allowed");
-
+ "Maximum number of mbuf page size jumbo clusters allowed");
static int
sysctl_nmbjumbo9(SYSCTL_HANDLER_ARGS)
@@ -178,11 +205,12 @@ sysctl_nmbjumbo9(SYSCTL_HANDLER_ARGS)
int error, newnmbjumbo9;
newnmbjumbo9 = nmbjumbo9;
- error = sysctl_handle_int(oidp, &newnmbjumbo9, 0, req);
+ error = sysctl_handle_int(oidp, &newnmbjumbo9, 0, req);
if (error == 0 && req->newptr) {
- if (newnmbjumbo9> nmbjumbo9) {
+ if (newnmbjumbo9 > nmbjumbo9 &&
+ nmbufs >= nmbclusters + nmbjumbop + nmbjumbo9 + nmbjumbo16) {
nmbjumbo9 = newnmbjumbo9;
- uma_zone_set_max(zone_jumbo9, nmbjumbo9);
+ nmbjumbo9 = uma_zone_set_max(zone_jumbo9, nmbjumbo9);
} else
error = EINVAL;
}
@@ -190,7 +218,7 @@ sysctl_nmbjumbo9(SYSCTL_HANDLER_ARGS)
}
SYSCTL_PROC(_kern_ipc, OID_AUTO, nmbjumbo9, CTLTYPE_INT|CTLFLAG_RW,
&nmbjumbo9, 0, sysctl_nmbjumbo9, "IU",
- "Maximum number of mbuf 9k jumbo clusters allowed");
+ "Maximum number of mbuf 9k jumbo clusters allowed");
static int
sysctl_nmbjumbo16(SYSCTL_HANDLER_ARGS)
@@ -198,11 +226,12 @@ sysctl_nmbjumbo16(SYSCTL_HANDLER_ARGS)
int error, newnmbjumbo16;
newnmbjumbo16 = nmbjumbo16;
- error = sysctl_handle_int(oidp, &newnmbjumbo16, 0, req);
+ error = sysctl_handle_int(oidp, &newnmbjumbo16, 0, req);
if (error == 0 && req->newptr) {
- if (newnmbjumbo16> nmbjumbo16) {
+ if (newnmbjumbo16 > nmbjumbo16 &&
+ nmbufs >= nmbclusters + nmbjumbop + nmbjumbo9 + nmbjumbo16) {
nmbjumbo16 = newnmbjumbo16;
- uma_zone_set_max(zone_jumbo16, nmbjumbo16);
+ nmbjumbo16 = uma_zone_set_max(zone_jumbo16, nmbjumbo16);
} else
error = EINVAL;
}
@@ -212,7 +241,26 @@ SYSCTL_PROC(_kern_ipc, OID_AUTO, nmbjumb
&nmbjumbo16, 0, sysctl_nmbjumbo16, "IU",
"Maximum number of mbuf 16k jumbo clusters allowed");
+static int
+sysctl_nmbufs(SYSCTL_HANDLER_ARGS)
+{
+ int error, newnmbufs;
+ newnmbufs = nmbufs;
+ error = sysctl_handle_int(oidp, &newnmbufs, 0, req);
+ if (error == 0 && req->newptr) {
+ if (newnmbufs > nmbufs) {
+ nmbufs = newnmbufs;
+ nmbufs = uma_zone_set_max(zone_mbuf, nmbufs);
+ EVENTHANDLER_INVOKE(nmbufs_change);
+ } else
+ error = EINVAL;
+ }
+ return (error);
+}
+SYSCTL_PROC(_kern_ipc, OID_AUTO, nmbufs, CTLTYPE_INT|CTLFLAG_RW,
+&nmbufs, 0, sysctl_nmbufs, "IU",
+ "Maximum number of mbufs allowed");
SYSCTL_STRUCT(_kern_ipc, OID_AUTO, mbstat, CTLFLAG_RD, &mbstat, mbstat,
"Mbuf general information and statistics");
@@ -241,7 +289,6 @@ static int mb_zinit_pack(void *, int, in
static void mb_zfini_pack(void *, int);
static void mb_reclaim(void *);
-static void mbuf_init(void *);
static void *mbuf_jumbo_alloc(uma_zone_t, int, uint8_t *, int);
/* Ensure that MSIZE doesn't break dtom() - it must be a power of 2 */
@@ -250,7 +297,6 @@ CTASSERT((((MSIZE - 1) ^ MSIZE) + 1) >>
/*
* Initialize FreeBSD Network buffer allocation.
*/
-SYSINIT(mbuf, SI_SUB_MBUF, SI_ORDER_FIRST, mbuf_init, NULL);
static void
mbuf_init(void *dummy)
{
@@ -266,6 +312,8 @@ mbuf_init(void *dummy)
NULL, NULL,
#endif
MSIZE - 1, UMA_ZONE_MAXBUCKET);
+ if (nmbufs > 0)
+ nmbufs = uma_zone_set_max(zone_mbuf, nmbufs);
zone_clust = uma_zcreate(MBUF_CLUSTER_MEM_NAME, MCLBYTES,
mb_ctor_clust, mb_dtor_clust,
@@ -276,7 +324,7 @@ mbuf_init(void *dummy)
#endif
UMA_ALIGN_PTR, UMA_ZONE_REFCNT);
if (nmbclusters > 0)
- uma_zone_set_max(zone_clust, nmbclusters);
+ nmbclusters = uma_zone_set_max(zone_clust, nmbclusters);
zone_pack = uma_zsecond_create(MBUF_PACKET_MEM_NAME, mb_ctor_pack,
mb_dtor_pack, mb_zinit_pack, mb_zfini_pack, zone_mbuf);
@@ -291,7 +339,7 @@ mbuf_init(void *dummy)
#endif
UMA_ALIGN_PTR, UMA_ZONE_REFCNT);
if (nmbjumbop > 0)
- uma_zone_set_max(zone_jumbop, nmbjumbop);
+ nmbjumbop = uma_zone_set_max(zone_jumbop, nmbjumbop);
zone_jumbo9 = uma_zcreate(MBUF_JUMBO9_MEM_NAME, MJUM9BYTES,
mb_ctor_clust, mb_dtor_clust,
@@ -301,9 +349,9 @@ mbuf_init(void *dummy)
NULL, NULL,
#endif
UMA_ALIGN_PTR, UMA_ZONE_REFCNT);
- if (nmbjumbo9 > 0)
- uma_zone_set_max(zone_jumbo9, nmbjumbo9);
uma_zone_set_allocf(zone_jumbo9, mbuf_jumbo_alloc);
+ if (nmbjumbo9 > 0)
+ nmbjumbo9 = uma_zone_set_max(zone_jumbo9, nmbjumbo9);
zone_jumbo16 = uma_zcreate(MBUF_JUMBO16_MEM_NAME, MJUM16BYTES,
mb_ctor_clust, mb_dtor_clust,
@@ -313,9 +361,9 @@ mbuf_init(void *dummy)
NULL, NULL,
#endif
UMA_ALIGN_PTR, UMA_ZONE_REFCNT);
- if (nmbjumbo16 > 0)
- uma_zone_set_max(zone_jumbo16, nmbjumbo16);
uma_zone_set_allocf(zone_jumbo16, mbuf_jumbo_alloc);
+ if (nmbjumbo16 > 0)
+ nmbjumbo16 = uma_zone_set_max(zone_jumbo16, nmbjumbo16);
zone_ext_refcnt = uma_zcreate(MBUF_EXTREFCNT_MEM_NAME, sizeof(u_int),
NULL, NULL,
@@ -351,6 +399,7 @@ mbuf_init(void *dummy)
mbstat.sf_iocnt = 0;
mbstat.sf_allocwait = mbstat.sf_allocfail = 0;
}
+SYSINIT(mbuf, SI_SUB_MBUF, SI_ORDER_FIRST, mbuf_init, NULL);
/*
* UMA backend page allocator for the jumbo frame zones.
@@ -435,7 +484,7 @@ static void
mb_dtor_mbuf(void *mem, int size, void *arg)
{
struct mbuf *m;
- unsigned long flags;
+ unsigned long flags;
m = (struct mbuf *)mem;
flags = (unsigned long)arg;
Modified: stable/9/sys/kern/subr_param.c
==============================================================================
--- stable/9/sys/kern/subr_param.c Mon Aug 19 08:28:35 2013 (r254514)
+++ stable/9/sys/kern/subr_param.c Mon Aug 19 09:49:51 2013 (r254515)
@@ -287,26 +287,40 @@ init_param2(long physpages)
maxusers = physpages / (2 * 1024 * 1024 / PAGE_SIZE);
if (maxusers < 32)
maxusers = 32;
- if (maxusers > 384)
- maxusers = 384;
- }
+#ifdef VM_MAX_AUTOTUNE_MAXUSERS
+ if (maxusers > VM_MAX_AUTOTUNE_MAXUSERS)
+ maxusers = VM_MAX_AUTOTUNE_MAXUSERS;
+#endif
+ /*
+ * Scales down the function in which maxusers grows once
+ * we hit 384.
+ */
+ if (maxusers > 384)
+ maxusers = 384 + ((maxusers - 384) / 8);
+ }
/*
* The following can be overridden after boot via sysctl. Note:
* unless overriden, these macros are ultimately based on maxusers.
- */
- maxproc = NPROC;
- TUNABLE_INT_FETCH("kern.maxproc", &maxproc);
- /*
* Limit maxproc so that kmap entries cannot be exhausted by
* processes.
*/
+ maxproc = NPROC;
+ TUNABLE_INT_FETCH("kern.maxproc", &maxproc);
if (maxproc > (physpages / 12))
maxproc = physpages / 12;
- maxfiles = MAXFILES;
- TUNABLE_INT_FETCH("kern.maxfiles", &maxfiles);
maxprocperuid = (maxproc * 9) / 10;
- maxfilesperproc = (maxfiles * 9) / 10;
+
+ /*
+ * The default limit for maxfiles is 1/12 of the number of
+ * physical page but not less than 16 times maxusers.
+ * At most it can be 1/6 the number of physical pages.
+ */
+ maxfiles = imax(MAXFILES, physpages / 8);
+ TUNABLE_INT_FETCH("kern.maxfiles", &maxfiles);
+ if (maxfiles > (physpages / 4))
+ maxfiles = physpages / 4;
+ maxfilesperproc = (maxfiles / 10) * 9;
/*
* Cannot be changed after boot.
@@ -315,7 +329,13 @@ init_param2(long physpages)
TUNABLE_INT_FETCH("kern.nbuf", &nbuf);
TUNABLE_INT_FETCH("kern.bio_transient_maxcnt", &bio_transient_maxcnt);
- ncallout = 16 + maxproc + maxfiles;
+ /*
+ * XXX: Does the callout wheel have to be so big?
+ *
+ * Clip callout to result of previous function of maxusers maximum
+ * 384. This is still huge, but acceptable.
+ */
+ ncallout = imin(16 + maxproc + maxfiles, 18508);
TUNABLE_INT_FETCH("kern.ncallout", &ncallout);
/*
@@ -323,12 +343,12 @@ init_param2(long physpages)
* max(1/64 of main memory, 512KB)). See sys_pipe.c for more details.
*/
maxpipekva = (physpages / 64) * PAGE_SIZE;
+ TUNABLE_LONG_FETCH("kern.ipc.maxpipekva", &maxpipekva);
if (maxpipekva < 512 * 1024)
maxpipekva = 512 * 1024;
if (maxpipekva > (VM_MAX_KERNEL_ADDRESS - VM_MIN_KERNEL_ADDRESS) / 64)
maxpipekva = (VM_MAX_KERNEL_ADDRESS - VM_MIN_KERNEL_ADDRESS) /
64;
- TUNABLE_LONG_FETCH("kern.ipc.maxpipekva", &maxpipekva);
}
/*
Modified: stable/9/sys/kern/uipc_socket.c
==============================================================================
--- stable/9/sys/kern/uipc_socket.c Mon Aug 19 08:28:35 2013 (r254514)
+++ stable/9/sys/kern/uipc_socket.c Mon Aug 19 09:49:51 2013 (r254515)
@@ -282,7 +282,7 @@ init_maxsockets(void *ignored)
{
TUNABLE_INT_FETCH("kern.ipc.maxsockets", &maxsockets);
- maxsockets = imax(maxsockets, imax(maxfiles, nmbclusters));
+ maxsockets = imax(maxsockets, maxfiles);
}
SYSINIT(param, SI_SUB_TUNABLES, SI_ORDER_ANY, init_maxsockets, NULL);
@@ -298,12 +298,9 @@ sysctl_maxsockets(SYSCTL_HANDLER_ARGS)
newmaxsockets = maxsockets;
error = sysctl_handle_int(oidp, &newmaxsockets, 0, req);
if (error == 0 && req->newptr) {
- if (newmaxsockets > maxsockets) {
+ if (newmaxsockets > maxsockets &&
+ newmaxsockets <= maxfiles) {
maxsockets = newmaxsockets;
- if (maxsockets > ((maxfiles / 4) * 3)) {
- maxfiles = (maxsockets * 5) / 4;
- maxfilesperproc = (maxfiles * 9) / 10;
- }
EVENTHANDLER_INVOKE(maxsockets_change);
} else
error = EINVAL;
Modified: stable/9/sys/sys/eventhandler.h
==============================================================================
--- stable/9/sys/sys/eventhandler.h Mon Aug 19 08:28:35 2013 (r254514)
+++ stable/9/sys/sys/eventhandler.h Mon Aug 19 09:49:51 2013 (r254515)
@@ -253,6 +253,7 @@ EVENTHANDLER_DECLARE(thread_fini, thread
typedef void (*uma_zone_chfn)(void *);
EVENTHANDLER_DECLARE(nmbclusters_change, uma_zone_chfn);
+EVENTHANDLER_DECLARE(nmbufs_change, uma_zone_chfn);
EVENTHANDLER_DECLARE(maxsockets_change, uma_zone_chfn);
#endif /* SYS_EVENTHANDLER_H */
Modified: stable/9/sys/sys/mbuf.h
==============================================================================
--- stable/9/sys/sys/mbuf.h Mon Aug 19 08:28:35 2013 (r254514)
+++ stable/9/sys/sys/mbuf.h Mon Aug 19 09:49:51 2013 (r254515)
@@ -396,7 +396,6 @@ struct mbstat {
*
* The rest of it is defined in kern/kern_mbuf.c
*/
-
extern uma_zone_t zone_mbuf;
extern uma_zone_t zone_clust;
extern uma_zone_t zone_pack;
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