Date: Tue, 15 Jan 2002 12:29:12 -0500 From: Joe Abley <jabley@automagic.org> To: freebsd-questions@freebsd.org Subject: NMBCLUSTERS question Message-ID: <20020115122911.I13795@buffoon.automagic.org>
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I have a machine running a reasonably recent build of 4-STABLE,
which talks to the rest of the world through an Intel EtherExpress
Pro NIC on fast 100M colo. There are periods when the fxp
interface can get quite full.
Every now and then the machine seems to drop off the net for a
little while, and the kernel spits out lots of these:
fxp0: cluster allocation failed, packet dropped!
fxp0: cluster allocation failed, packet dropped!
fxp0: cluster allocation failed, packet dropped!
m_clalloc failed, consider increase NMBCLUSTERS value
fxp0: cluster allocation failed, packet dropped!
fxp0: cluster allocation failed, packet dropped!
fxp0: cluster allocation failed, packet dropped!
m_clalloc failed, consider increase NMBCLUSTERS value
fxp0: cluster allocation failed, packet dropped!
fxp0: cluster allocation failed, packet dropped!
fxp0: cluster allocation failed, packet dropped!
fxp0: cluster allocation failed, packet dropped!
fxp0: cluster allocation failed, packet dropped!
m_clalloc failed, consider increase NMBCLUSTERS value
fxp0: cluster allocation failed, packet dropped!
fxp0: cluster allocation failed, packet dropped!
m_clalloc failed, consider increase NMBCLUSTERS value
fxp0: cluster allocation failed, packet dropped!
fxp0: cluster allocation failed, packet dropped!
fxp0: cluster allocation failed, packet dropped!
I don't have an NMBCLUSTERS option set in my kernel conf file. I
see LINT says:
# Set the size of the mbuf KVM reservation, in clusters. This is scaled
# by approximately 2048 bytes. The system will auto-size the mbuf area
# if this options is not specified or set to 0.
#
options NMBCLUSTERS=1024
Does this auto-sizing not work if interfaces are busy? Any
advice as to what I might set NMBCLUSTERS to?
Joe
jabley@buffoon[130]$ uname -a
FreeBSD buffoon.automagic.org 4.4-STABLE FreeBSD 4.4-STABLE #2: Thu Dec 6 11:30:25 EST 2001 jabley@buffoon.automagic.org:/usr/obj/usr/src/sys/BUFFOON i386
jabley@buffoon[131]$ netstat -m
1248/2384/8192 mbufs in use (current/peak/max):
1188 mbufs allocated to data
60 mbufs allocated to packet headers
1136/2048/2048 mbuf clusters in use (current/peak/max)
4692 Kbytes allocated to network (76% of mb_map in use)
25975 requests for memory denied
165 requests for memory delayed
0 calls to protocol drain routines
jabley@buffoon[132]$ cat /sys/i386/conf/BUFFOON
# $Id: BUFFOON,v 1.2 2001/10/22 18:10:37 jabley Exp $
machine i386
cpu I686_CPU
ident BUFFOON
maxusers 96
options MATH_EMULATE #Support for x87 emulation
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 MFS #Memory Filesystem
options MD_ROOT #MD is a potential root device
options NFS #Network Filesystem
options NFS_ROOT #NFS usable as root device, NFS required
options MSDOSFS #MSDOS Filesystem
options CD9660 #ISO 9660 Filesystem
options CD9660_ROOT #CD-ROM usable as root, CD9660 required
options PROCFS #Process filesystem
options COMPAT_43 #Compatible with BSD 4.3 [KEEP THIS!]
options UCONSOLE #Allow users to grab the console
options USERCONFIG #boot -c editor
options VISUAL_USERCONFIG #visual boot -c editor
options KTRACE #ktrace(1) support
options SYSVSHM #SYSV-style shared memory
options SYSVMSG #SYSV-style message queues
options SYSVSEM #SYSV-style semaphores
options P1003_1B #Posix P1003_1B real-time extensions
options _KPOSIX_PRIORITY_SCHEDULING
options ICMP_BANDLIM #Rate limit bad replies
options KBD_INSTALL_CDEV # install a CDEV entry in /dev
options MROUTING
device isa
device pci
# Floppy drives
device fdc0 at isa? port IO_FD1 irq 6 drq 2
device fd0 at fdc0 drive 0
device fd1 at fdc0 drive 1
# ATA and ATAPI devices
device ata0 at isa? port IO_WD1 irq 14
device ata1 at isa? port IO_WD2 irq 15
device ata
device atadisk # ATA disk drives
device atapicd # ATAPI CDROM drives
device atapifd # ATAPI floppy drives
device atapist # ATAPI tape drives
options ATA_STATIC_ID #Static device numbering
# atkbdc0 controls both the keyboard and the PS/2 mouse
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?
# splash screen/screen saver
pseudo-device splash
# syscons is the default console driver, resembling an SCO console
device sc0 at isa? flags 0x100
# Floating point support - do not disable.
device npx0 at nexus? port IO_NPX irq 13
# Power management support (see LINT for more options)
device apm0 at nexus? disable flags 0x20 # Advanced Power Management
# Serial (COM) ports
device sio0 at isa? port IO_COM1 flags 0x10 irq 4
device sio1 at isa? port IO_COM2 irq 3
device sio2 at isa? disable port IO_COM3 irq 5
device sio3 at isa? disable port IO_COM4 irq 9
# Parallel port
device ppc0 at isa? irq 7
device ppbus # Parallel port bus (required)
device lpt # Printer
device plip # TCP/IP over parallel
device ppi # Parallel port interface device
device miibus # MII bus support
device fxp # Intel EtherExpress PRO/100B (82557, 82558)
# Pseudo devices - the number indicates how many units to allocate.
pseudo-device loop # Network loopback
pseudo-device ether # Ethernet support
pseudo-device sl 1 # Kernel SLIP
pseudo-device ppp 1 # Kernel PPP
pseudo-device tun # Packet tunnel.
pseudo-device pty # Pseudo-ttys (telnet etc)
pseudo-device md # Memory "disks"
pseudo-device gif # IPv6 and IPv4 tunneling
pseudo-device faith 1 # IPv6-to-IPv4 relaying (translation)
# The `bpf' pseudo-device enables the Berkeley Packet Filter.
# Be aware of the administrative consequences of enabling this!
pseudo-device bpf #Berkeley packet filter
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