I've had a few panics. Attached are the output from vmsat -m then -z.
uname -a
FreeBSD mars.sbcglobal.net 7.0-RELEASE-p5 FreeBSD 7.0-RELEASE-p5 #0: Mon Nov 24 23:03:01 CST 2008 boxend at mars.sbcglobal.net:/usr/src/sys/i386/compile/MARS i386
Jan 1 08:56:39 mars savecore: reboot after panic: kmem_malloc(12288): kmem_map too small: 128778240 total allocated
Jan 1 08:56:39 mars savecore: writing core to vmcore.2
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Type InUse MemUse HighUse Requests Size(s)
GEOM 228 32K - 1206 16,32,64,128,256,512,1024,2048
isadev 20 2K - 20 64
CAM dev queue 5 1K - 5 64
ata_generic 6 6K - 6 1024
ad_driver 5 1K - 5 32
ata_dma 4 1K - 4 128
cdev 21 3K - 21 128
sigio 1 1K - 1 32
filedesc 90 23K - 1606 16,256,512
kenv 113 8K - 115 16,32,64,4096
kqueue 0 0K - 166 128,1024
proc-args 39 2K - 7402 16,32,64,128,256
ata_cam 4 4K - 27 64,256,1024
ithread 63 6K - 65 16,64,128
acd_driver 1 2K - 1 2048
KTRACE 100 13K - 100 128
ath_hal 6 23K - 6 128,256,512,1024
linker 106 361K - 520 16,32,64,256,1024,2048,4096
lockf 14 1K - 12884 64
athdev 3 37K - 3 256
ip6ndp 4 1K - 4 64,128
temp 20 137K - 6437 16,32,64,128,256,512,1024,2048,4096
devbuf 489 3364K - 23810 16,32,64,128,256,512,1024,2048,4096
CAM queue 17 1K - 112 16
module 247 16K - 273 64,128
mtx_pool 1 4K - 1 4096
kbdmux 6 9K - 6 16,128,256,2048,4096
subproc 192 371K - 1707 256,4096
proc 2 4K - 2 2048
session 27 2K - 125 64
pgrp 36 3K - 169 64
cred 34 9K - 6399 256
uidinfo 4 1K - 101 32,512
plimit 20 5K - 1286 256
sysctltmp 0 0K - 284 16,32,64,128
sysctloid 2916 89K - 3116 16,32,64
sysctl 0 0K - 475 16,32,64
umtx 112 7K - 112 64
p1003.1b 1 1K - 1 16
SWAP 2 141K - 2 64
bus-sc 58 28K - 963 16,32,64,128,256,512,1024,2048,4096
bus 800 36K - 3148 16,32,64,128,1024
devstat 16 33K - 16 16,4096
eventhandler 65 4K - 65 32,64,128
kobj 148 296K - 225 2048
CAM SIM 5 1K - 5 128
rman 161 10K - 525 16,32,64
CAM periph 4 1K - 9 16,32,128
sbuf 0 0K - 792 16,32,64,128,256,512,1024,2048,4096
CAM XPT 42 13K - 147 16,32,64,256,512,1024
taskqueue 17 2K - 17 16,128
Unitno 7 1K - 13 16,64
iov 0 0K - 561 16,64,128,256
ioctlops 0 0K - 5774 16,32,64,128,256,512,1024
msg 4 25K - 4 1024,4096
sem 4 7K - 4 256,1024,4096
shm 1 12K - 1
ttys 1232 175K - 4907 128,1024
ptys 3 1K - 3 128
mbuf_tag 5382 169K - 5399 32
scsi_cd 0 0K - 5 16
pcb 25 77K - 195 16,32,64,2048,4096
soname 4 1K - 1753 16,32,128
biobuf 11 22K - 277 2048
vfscache 1 128K - 1
cl_savebuf 0 0K - 1672 32,64
vfs_hash 1 64K - 1
vnodes 1 1K - 1 128
vnodemarker 0 0K - 9656 512
mount 139 5K - 325 16,32,64,128,256
BPF 9 65K - 10 16,64,128,256
ether_multi 15 1K - 16 16,32,64
ifaddr 235 15K - 235 16,32,64,128,256,512,2048
ifnet 4 4K - 4 128,1024
clone 5 20K - 5 4096
arpcom 2 1K - 2 16
lo 1 1K - 1 16
entropy 1024 64K - 1024 64
routetbl 154 35K - 233 16,32,64,128,256
80211node 8081 21705K - 8081 16,32,512
80211scan 5 3K - 5 256,2048
in_multi 2 1K - 2 64
IpFw/IpAcct 1 1K - 1 64
sctp_iter 0 0K - 2 128
sctp_ifn 2 1K - 2 128
sctp_ifa 3 1K - 3 128
sctp_vrf 1 1K - 1 64
sctp_a_it 0 0K - 2 16
hostcache 1 20K - 1
syncache 1 72K - 1
in6_multi 16 1K - 16 16,32,64
USBdev 8 4K - 8 128,512
nfss_daemon 1 8K - 1
agp 2 65K - 2 16
audit_evclass 150 3K - 187 16
savedino 0 0K - 103 256
dirrem 0 0K - 446 32
mkdir 0 0K - 12 32
diradd 2 1K - 451 64
freefile 0 0K - 151 32
freeblks 0 0K - 148 256
freefrag 0 0K - 7356 32
allocindir 715 45K - 290848 64
indirdep 3 1K - 5146 32
allocdirect 0 0K - 593 128
bmsafemap 3 1K - 9237 64
newblk 1 1K - 291442 64,256
inodedep 3 65K - 527 128
pagedep 3 17K - 113 64
ufs_dirhash 57 12K - 57 16,32,64,128,256,512
ufs_mount 24 134K - 52 128,256,2048,4096
UMAHash 2 1K - 3 256,512
USB 30 4K - 36 16,32,64,128,512,1024
DEVFS1 102 26K - 104 256
DEVFS3 113 15K - 116 128
vm_pgdata 2 33K - 2 64
atkbddev 2 1K - 2 32
DEVFS 12 1K - 13 16,64
io_apic 1 1K - 1 1024
memdesc 1 4K - 1 4096
nexusdev 5 1K - 5 16
pfs_nodes 20 3K - 20 128
ac97 2 1K - 2 16,512
feeder 401 7K - 412 16,64
acpica 993 51K - 34563 16,32,64,128,256,512,1024
acpitask 0 0K - 1 32
acpidev 44 2K - 44 32
mixer 1 4K - 1 4096
acpisem 15 1K - 15 64
apmdev 1 1K - 1 64
pci_link 16 2K - 16 64,128
linux 12 1K - 12 32,64
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ITEM SIZE LIMIT USED FREE REQUESTS FAILURES
UMA Kegs: 128, 0, 82, 8, 82, 0
UMA Zones: 120, 0, 82, 8, 82, 0
UMA Slabs: 64, 0, 3125, 2, 27604, 0
UMA RCntSlabs: 104, 0, 94, 17, 94, 0
UMA Hash: 128, 0, 4, 26, 6, 0
16 Bucket: 76, 0, 25, 25, 30, 0
32 Bucket: 140, 0, 17, 11, 28, 0
64 Bucket: 268, 0, 24, 18, 52, 0
128 Bucket: 524, 0, 21, 14, 1612, 0
VM OBJECT: 124, 0, 1561, 113, 23260, 0
MAP: 140, 0, 7, 49, 7, 0
KMAP ENTRY: 68, 23856, 30, 138, 54546, 0
MAP ENTRY: 68, 0, 1481, 255, 52304, 0
DP fakepg: 72, 0, 0, 0, 0, 0
mt_zone: 64, 0, 229, 66, 229, 0
16: 16, 0, 3148, 100, 23267, 0
32: 32, 0, 12357, 186, 44480, 0
64: 64, 0, 4430, 1175, 621113, 0
128: 128, 0, 1862, 268, 11080, 0
256: 256, 0, 567, 48, 11518, 0
512: 512, 0, 85, 19, 10212, 0
1024: 1024, 0, 65, 83, 2797, 0
2048: 2048, 0, 186, 40, 606, 0
4096: 4096, 0, 149, 18, 5789, 0
Files: 72, 0, 129, 83, 9202, 0
TURNSTILE: 76, 0, 113, 79, 113, 0
umtx pi: 52, 0, 0, 0, 0, 0
PROC: 684, 0, 85, 20, 1601, 0
THREAD: 516, 0, 105, 7, 105, 0
UPCALL: 44, 0, 0, 0, 0, 0
SLEEPQUEUE: 32, 0, 113, 113, 113, 0
VMSPACE: 232, 0, 40, 28, 1556, 0
audit_record: 856, 0, 0, 0, 0, 0
mbuf_packet: 256, 0, 40, 88, 153051, 0
mbuf: 256, 0, 5386, 126, 212223, 0
mbuf_cluster: 2048, 12992, 128, 6, 128, 0
mbuf_jumbo_pagesize: 4096, 6496, 0, 27, 7175, 0
mbuf_jumbo_9k: 9216, 3248, 0, 0, 0, 0
mbuf_jumbo_16k: 16384, 1624, 0, 0, 0, 0
mbuf_ext_refcnt: 4, 0, 0, 0, 0, 0
ACL UMA zone: 388, 0, 0, 0, 0, 0
g_bio: 132, 0, 0, 1943, 1246918, 0
ata_request: 192, 0, 0, 480, 336499, 0
ata_composite: 184, 0, 0, 0, 0, 0
VNODE: 272, 0, 815, 25, 968, 0
VNODEPOLL: 64, 0, 0, 0, 0, 0
NAMEI: 1024, 0, 0, 20, 27708, 0
S VFS Cache: 68, 0, 776, 64, 3900, 0
L VFS Cache: 291, 0, 0, 0, 0, 0
DIRHASH: 1024, 0, 159, 17, 159, 0
NFSMOUNT: 472, 0, 0, 0, 0, 0
NFSNODE: 456, 0, 0, 0, 0, 0
pipe: 396, 0, 5, 25, 687, 0
ksiginfo: 80, 0, 71, 73, 71, 0
itimer: 220, 0, 0, 0, 0, 0
KNOTE: 68, 0, 0, 112, 166, 0
socket: 396, 6030, 37, 13, 643, 0
ipq: 32, 452, 0, 0, 0, 0
udpcb: 180, 6028, 13, 31, 420, 0
inpcb: 180, 6028, 10, 34, 77, 0
tcpcb: 464, 6024, 10, 14, 77, 0
tcptw: 52, 1224, 0, 0, 0, 0
syncache: 100, 15366, 0, 78, 4, 0
hostcache: 76, 15400, 1, 99, 1, 0
tcpreass: 20, 845, 0, 169, 2, 0
sackhole: 20, 0, 0, 0, 0, 0
sctp_ep: 804, 6025, 0, 0, 0, 0
sctp_asoc: 1400, 40000, 0, 0, 0, 0
sctp_laddr: 24, 80040, 0, 145, 2, 0
sctp_raddr: 396, 80000, 0, 0, 0, 0
sctp_chunk: 92, 400008, 0, 0, 0, 0
sctp_readq: 76, 400000, 0, 0, 0, 0
sctp_stream_msg_out: 60, 400050, 0, 0, 0, 0
sctp_asconf_ack: 24, 400055, 0, 0, 0, 0
ripcb: 180, 6028, 0, 0, 0, 0
unpcb: 168, 6026, 13, 33, 144, 0
rtentry: 120, 0, 11, 53, 25, 0
divcb: 180, 6028, 0, 0, 0, 0
IPFW dynamic rule: 108, 0, 0, 0, 0, 0
SWAPMETA: 276, 47166, 8, 20, 20, 0
Mountpoints: 668, 0, 9, 9, 9, 0
FFS inode: 132, 0, 758, 25, 909, 0
FFS1 dinode: 128, 0, 0, 0, 0, 0
FFS2 dinode: 256, 0, 758, 22, 909, 0