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
servers?
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 _KPOSIX_PRIORITY_SCHEDULING
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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