Over the past week, I've been trying to get information on how to fix a
server that panics with:

| panic: vm_map_entry_create: kernel resources exhausted
| mp_lock = 01000001; cpuid = 1; lapic.id = 01000000
| boot() called on cpu#1

Great ... but, how do I determine what 'resources' I need to increase to
avoid that crash?  I've tried increasing maxusers from 512->1024, but *if*
that works, I imagine I'm raising a bunch of limits (and using memory)
that I don't have to ...

The server is a Dual-CPU PIII-1Ghz with 3Gig of RAM and ~3Gig of swap
space right now ... the data drive is 5x18gig drives in a RAID5
configuration (hardware RAID, not vinum) ...

I ran top in an xterm so that I could see what was up just before the
crash, and the results were:

last pid: 84988;  load averages: 19.82, 57.35, 44.426   up 0+23:33:12 02:05:00
5021 processes:16 running, 5005 sleeping
CPU states:  8.7% user,  0.0% nice, 24.3% system,  2.2% interrupt, 64.7% idle
Mem: 2320M Active, 211M Inact, 390M Wired, 92M Cache, 199M Buf, 4348K Free
Swap: 3072M Total, 1048M Used, 2024M Free, 34% Inuse, 448K Out

        So, I have plenty of swapspace left, lots of idle CPU and a whole
whack of processes ...

        Now, looking at the LINT file, there appears to be *alot* of
things I *could* change ... for instance, NSFBUFS, KVA_FILES, etc ... but
I don't imagine that changing these blindly is particularly wise ... so,
how do you determine what to change?  For instance, at a maxusers of 512,
NSFBUFS should be ~8704, and if I've only got 5000 processes running,
chances are I'm still safe at that value, no?  But sysctl doesn't show any
'sf_buf' value, so how do I figure out what I'm using?

        Basically, are there any commands similar to "netstat -m" for
nmbclusters that I can run to 'monitor' and isolate where I'm exhausting
these resources?

        Is there a doc on this sort of stuff that I should be reading for
this?  Something that talks about kernel tuning for high-load/processes

        Thanks for any help in advance ..

machine         i386
cpu             I686_CPU
ident           kernel
maxusers        1024

options         NMBCLUSTERS=15360

options         INET                    #InterNETworking
options         INET6                   #IPv6 communications protocols
options         FFS                     #Berkeley Fast Filesystem
options         FFS_ROOT                #FFS usable as root device [keep this!]
options         SOFTUPDATES             #Enable FFS soft updates support
options         PROCFS                  #Process filesystem
options         COMPAT_43               #Compatible with BSD 4.3 [KEEP THIS!]
options         SCSI_DELAY=15000        #Delay (in ms) before probing SCSI
options         KTRACE                  #ktrace(1) support

options         SYSVSHM
options         SHMMAXPGS=98304
options         SHMMAX=(SHMMAXPGS*PAGE_SIZE+1)

options         SYSVSEM
options         SEMMNI=2048
options         SEMMNS=4096

options         SYSVMSG                 #SYSV-style message queues

options         P1003_1B                #Posix P1003_1B real-time extensions
options         ICMP_BANDLIM            #Rate limit bad replies

options         SMP                     # Symmetric MultiProcessor Kernel
options         APIC_IO                 # Symmetric (APIC) I/O

device          isa
device          pci

device          scbus           # SCSI bus (required)
device          da              # Direct Access (disks)
device          sa              # Sequential Access (tape etc)
device          cd              # CD
device          pass            # Passthrough device (direct SCSI access)

device          amr             # AMI MegaRAID
device          sym

device          atkbdc0 at isa? port IO_KBD
device          atkbd0  at atkbdc? irq 1 flags 0x1
device          psm0    at atkbdc? irq 12

device          vga0    at isa?

pseudo-device   splash

device          sc0     at isa? flags 0x100

device          npx0    at nexus? port IO_NPX irq 13

device          sio0    at isa? port IO_COM1 flags 0x10 irq 4
device          sio1    at isa? port IO_COM2 irq 3

device          miibus          # MII bus support
device          fxp             # Intel EtherExpress PRO/100B (82557, 82558)

pseudo-device   loop            # Network loopback
pseudo-device   ether           # Ethernet support
pseudo-device   pty     256             # Pseudo-ttys (telnet etc)
pseudo-device   gif             # IPv6 and IPv4 tunneling
pseudo-device   faith   1       # IPv6-to-IPv4 relaying (translation)

pseudo-device   bpf             #Berkeley packet filter

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