>Number:         8370
>Category:       kern
>Synopsis:       NFS server runs out of mbufs
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    kern-bug-people (Kernel Bug People)
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri Sep 10 15:35:00 1999
>Last-Modified:
>Originator:     Christian E. Hopps
>Organization:
	Merit.
>Release:        1.3K just prior to 1.4
>Environment:
	
System: 
NetBSD theking.merit.edu 1.3K NetBSD 1.3K (ELVIS) #2: Wed Sep  8 17:36:05 EDT 1999     chopps@theking.merit.edu:/gated/NetBSD/src/sys/arch/i386/compile/ELVIS
i386

>Description:

Find below the current config file and the dmesg output. The previous
config file was identical except it had BUFPAGES and NMBCLUSTERS at
2048.  With these old values the system ran out of mbufs in about 4
days.  The NFS server was at times under heavy load (with anywhere from
1-12 users home dirs and possibly many simotaneous builds of gated going
at once).

An upgrade to 1.4 was attempted but performance appeared to drop for
solaris clients and so was reverted.  UDP is forced on the server (i.e.,
no tcp serverse are launched (nfsd -u).

Unfortunetly I don't have time to debug this problem but I was told that
reporting it would be useful anyway so you now have all the information
I have on the problem.

Thanks,
Chris.

Here is the dmesg:


NetBSD 1.3K (ELVIS) #2: Wed Sep  8 17:36:05 EDT 1999
    chopps@theking.merit.edu:/gated/NetBSD/src/sys/arch/i386/compile/ELVIS
cpu0: family 6 model 1 step 9
cpu0: Intel Pentium Pro (686-class)
real mem  = 66715648
avail mem = 58941440
using 840 buffers containing 3440640 bytes of memory
mainbus0 (root)
pci0 at mainbus0 bus 0: configuration mode 1
pci0: i/o enabled, memory enabled
pchb0 at pci0 dev 0 function 0
pchb0: Intel 82441FX PCI and Memory Controller (PMC) (rev. 0x02)
pcib0 at pci0 dev 7 function 0
pcib0: Intel 82371SB PCI-to-ISA Bridge (PIIX3) (rev. 0x01)
pciide0 at pci0 dev 7 function 1: Intel 82371SB IDE Interface (PIIX3)
pciide0: bus-master DMA support present
pciide0: primary channel wired to compatibility mode
pciide0: primary channel ignored (disabled)
pciide0: secondary channel wired to compatibility mode
pciide0: secondary channel ignored (disabled)
ahc1 at pci0 dev 17 function 0
ahc1: interrupting at irq 15
ahc1: aic7880 Wide Channel, SCSI Id=7, 16 SCBs
scsibus0 at ahc1 channel 0: 16 targets, 8 luns per target
ahc1: target 0 using 16Bit transfers
ahc1: target 0 synchronous at 20.0MHz, offset = 0x8
sd0 at scsibus0 targ 0 lun 0: <WDIGTL, ENTERPRISE, 1.61> SCSI2 0/direct fixed
sd0: 4157MB, 5720 cyl, 8 head, 186 sec, 512 bytes/sect x 8515173 sectors
ahc1: target 1 using 16Bit transfers
ahc1: target 1 synchronous at 20.0MHz, offset = 0x8
sd1 at scsibus0 targ 1 lun 0: <SEAGATE, ST34371W, 0338> SCSI2 0/direct fixed
sd1: 4148MB, 5168 cyl, 10 head, 164 sec, 512 bytes/sect x 8496960 sectors
ahc1: target 2 using 16Bit transfers
ahc1: target 2 synchronous at 20.0MHz, offset = 0x8
sd2 at scsibus0 targ 2 lun 0: <SEAGATE, ST34371W, 0338> SCSI2 0/direct fixed
sd2: 4148MB, 5168 cyl, 10 head, 164 sec, 512 bytes/sect x 8496960 sectors
ahc1: target 3 using 16Bit transfers
ahc1: target 3 synchronous at 20.0MHz, offset = 0x8
sd3 at scsibus0 targ 3 lun 0: <SEAGATE, ST118273LW, 5960> SCSI2 0/direct fixed
sd3: 17366MB, 7501 cyl, 20 head, 237 sec, 512 bytes/sect x 35566480 sectors
ahc2 at pci0 dev 18 function 0
ahc2: interrupting at irq 11
ahc2: aic7880 Wide Channel, SCSI Id=7, 16 SCBs
scsibus1 at ahc2 channel 0: 16 targets, 8 luns per target
ahc2: target 0 using 16Bit transfers
ahc2: target 0 synchronous at 20.0MHz, offset = 0x8
sd4 at scsibus1 targ 0 lun 0: <SEAGATE, ST34555W, 0930> SCSI2 0/direct fixed
sd4: 4340MB, 6300 cyl, 8 head, 176 sec, 512 bytes/sect x 8888924 sectors
ahc2: target 1 using 16Bit transfers
ahc2: target 1 synchronous at 20.0MHz, offset = 0x8
sd5 at scsibus1 targ 1 lun 0: <SEAGATE, ST39173W, 5698> SCSI2 0/direct fixed
sd5: 8683MB, 7501 cyl, 10 head, 237 sec, 512 bytes/sect x 17783240 sectors
ahc2: target 2 using 16Bit transfers
ahc2: target 2 synchronous at 20.0MHz, offset = 0x8
sd6 at scsibus1 targ 2 lun 0: <SEAGATE, ST39173W, 6244> SCSI2 0/direct fixed
sd6: 8683MB, 7501 cyl, 10 head, 237 sec, 512 bytes/sect x 17783240 sectors
ahc2: target 3 using 16Bit transfers
ahc2: target 3 synchronous at 20.0MHz, offset = 0x8
sd7 at scsibus1 targ 3 lun 0: <SEAGATE, ST39173W, 6244> SCSI2 0/direct fixed
sd7: 8683MB, 7501 cyl, 10 head, 237 sec, 512 bytes/sect x 17783240 sectors
de0 at pci0 dev 19 function 0
de0: interrupting at irq 10
de0: 21140A [10-100Mb/s] pass 2.2
de0: address 00:60:67:30:8d:f9
de1 at pci0 dev 20 function 0
de1: interrupting at irq 9
de1: 21140A [10-100Mb/s] pass 2.2
de1: address 00:60:67:30:8e:14
isa0 at pcib0
com0 at isa0 port 0x3f8-0x3ff irq 4: ns16550a, working fifo
com0: console
com1 at isa0 port 0x2f8-0x2ff irq 3: ns16550a, working fifo
vga0 at isa0 port 0x3b0-0x3df iomem 0xa0000-0xbffff
wsdisplay0 at vga0
lpt0 at isa0 port 0x378-0x37b irq 7
pckbc0 at isa0 port 0x60-0x64
pckbd0 at pckbc0 (kbd slot)
pckbc0: using irq 1 for kbd slot
wskbd0 at pckbd0
opmsprobe: command error
pcppi0 at isa0 port 0x61
midi0 at pcppi0: <PC speaker>
sysbeep0 at pcppi0
isapnp0 at isa0 port 0x279: ISA Plug 'n Play device support
npx0 at isa0 port 0xf0-0xff: using exception 16
fdc0 at isa0 port 0x3f0-0x3f7 irq 6 drq 2
fd0 at fdc0 drive 0: 1.44MB, 80 cyl, 2 head, 18 sec
isapnp0: no ISA Plug 'n Play devices found
biomask 8840 netmask 8e40 ttymask 8ec2
matchbiosdisks: no BIOS_GEOM info
wscons: wskbd0 glued to wsdisplay0
boot device: sd0
root on sd0a dumps on sd0b
de1: enabling 100baseTX port
de0: enabling 100baseTX port
WARNING: old BSD partition ID!
root file system type: ffs
de1: abnormal interrupt: transmit underflow (raising TX threshold to 96|256)
de1: abnormal interrupt: transmit underflow (raising TX threshold to 160|1024)
de0: abnormal interrupt: transmit underflow (raising TX threshold to 96|256)
de0: abnormal interrupt: transmit underflow (raising TX threshold to 128|512)
de0: abnormal interrupt: transmit underflow (raising TX threshold to 160|1024)
de0: abnormal interrupt: transmit underflow (switching to store-and-forward mode)
arp info overwritten for 198.108.60.197 by 00:c0:4f:a3:3f:2d
arp info overwritten for 198.108.60.197 by 00:60:08:24:4d:c1
arp info overwritten for 198.108.60.197 by 00:c0:4f:a3:3f:2d
arp info overwritten for 198.108.60.197 by 00:60:08:24:4d:c1

Here is the config file for the kernel:

#	$NetBSD: GENERIC,v 1.226 1999/03/25 17:06:38 perry Exp $
#
#	GENERIC -- everything that's currently supported
#

include "arch/i386/conf/std.i386"

options BUFPAGES=4096
options NMBCLUSTERS=4096
options NKMEMCLUSTERS=2048

maxusers	32		# estimated number of users

# CPU support.  At least one is REQUIRED.
options 	I386_CPU
options 	I486_CPU
options 	I586_CPU
options 	I686_CPU

# CPU-related options.
options 	MATH_EMULATE	# floating point emulation
#options 	VM86		# virtual 8086 emulation
options 	USER_LDT	# user-settable LDT; used by WINE
# eliminate delay no-ops in I/O; recommended on all but very old machines
options 	DUMMY_NOPS

# delay between "rebooting ..." message and hardware reset, in milliseconds
#options 	CPURESET_DELAY=2000

# Misc. i386-specific options
#options 	XSERVER		# X server support in console drivers
#options 	XSERVER_DDB	# PF12 gets you into DDB when X is running

# This option allows you to force a serial console at the specified
# I/O address.   see console(4) for details.
options        "CONSDEVNAME=\"com\"",CONADDR=0x3f8,CONSPEED=9600
#	you don't want the option below ON iff you are using the
#	serial console option of the new boot strap code.
options	CONS_OVERRIDE	# Always use above! independent of boot info

# The following options override the memory sizes passed in from the boot
# block.  Use them *only* if the boot block is unable to determine the correct
# values.  Note that the BIOS may *correctly* report less than 640k of base
# memory if the extended BIOS data area is located at the top of base memory
# (as is the case on most recent systems).
#options 	REALBASEMEM=639		# size of base memory (in KB)
#options 	REALEXTMEM=15360	# size of extended memory (in KB)

# Standard system options

options 	UCONSOLE	# users can use TIOCCONS (for xconsole)
options 	INSECURE	# disable kernel security levels

options 	RTC_OFFSET=0	# hardware clock is this many mins. west of GMT
options 	NTP		# NTP phase/frequency locked loop

options 	KTRACE		# system call tracing via ktrace(1)

options 	SYSVMSG		# System V-like message queues
options 	SYSVSEM		# System V-like semaphores
options 	SYSVSHM		# System V-like memory sharing
#options 	SHMMAXPGS=1024	# 1024 pages is the default

options 	LKM		# loadable kernel modules

# Diagnostic/debugging support options
options 	DIAGNOSTIC	# cheap kernel consistency checks
#options 	DEBUG		# expensive debugging checks/support
#options 	KMEMSTATS	# kernel memory statistics (vmstat -m)
options 	DDB		# in-kernel debugger
options		DDB_ONPANIC=0	# don't drop into ddb on panic
options 	DDB_HISTORY_SIZE=100	# enable history editing in DDB
#options 	KGDB		# remote debugger
#options 	"KGDB_DEVNAME=\"com\"",KGDBADDR=0x3f8,KGDBRATE=9600
makeoptions	DEBUG="-g"	# compile full symbol table

# Compatibility options
options 	COMPAT_NOMID	# compatibility with 386BSD, BSDI, NetBSD 0.8,
options 	COMPAT_09	# NetBSD 0.9,
options 	COMPAT_10	# NetBSD 1.0,
options 	COMPAT_11	# NetBSD 1.1,
options 	COMPAT_12	# NetBSD 1.2,
options 	COMPAT_13	# NetBSD 1.3,
options 	COMPAT_43	# and 4.3BSD
options 	COMPAT_386BSD_MBRPART # recognize old partition ID

options 	COMPAT_SVR4	# binary compatibility with SVR4
options 	COMPAT_IBCS2	# binary compatibility with SCO and ISC
options 	COMPAT_LINUX	# binary compatibility with Linux
options 	COMPAT_FREEBSD	# binary compatibility with FreeBSD

# Executable format options
options 	EXEC_ELF32	# 32-bit ELF executables (SVR4, Linux)

# File systems
file-system 	FFS		# UFS
#file-system 	EXT2FS		# second extended file system (linux)
#file-system 	LFS		# log-structured file system
file-system 	MFS		# memory file system
file-system 	NFS		# Network File System client
file-system 	CD9660		# ISO 9660 + Rock Ridge file system
#file-system 	MSDOSFS		# MS-DOS file system
file-system 	FDESC		# /dev/fd
file-system 	KERNFS		# /kern
#file-system 	NULLFS		# loopback file system
#file-system 	PORTAL		# portal filesystem (still experimental)
file-system 	PROCFS		# /proc
#file-system 	UMAPFS		# NULLFS + uid and gid remapping
#file-system 	UNION		# union file system
#file-system	CODA		# Coda File System; also needs vcoda (below)

# File system options
options 	QUOTA		# UFS quotas
#options 	FFS_EI		# FFS Endian Independant support
options 	NFSSERVER	# Network File System server
#options 	EXT2FS_SYSTEM_FLAGS # makes ext2fs file flags (append and
				# immutable) behave as system flags.

# Networking options
options 	GATEWAY		# packet forwarding
options 	INET		# IP + ICMP + TCP + UDP
#options 	MROUTING	# IP multicast routing
#options 	NS		# XNS
#options 	NSIP		# XNS tunneling over IP
#options 	ISO,TPIP	# OSI
#options 	EON		# OSI tunneling over IP
#options 	CCITT,LLC,HDLC	# X.25
#options 	NETATALK	# AppleTalk networking protocols
#options 	PPP_BSDCOMP	# BSD-Compress compression support for PPP
#options 	PPP_DEFLATE	# Deflate compression support for PPP
#options 	PPP_FILTER	# Active filter support for PPP (requires bpf)
#options 	PFIL_HOOKS	# pfil(9) packet filter hooks
#options 	IPFILTER_LOG	# ipmon(8) log support

# Compatibility with 4.2BSD implementation of TCP/IP.  Not recommended.
#options 	TCP_COMPAT_42

# These options enable verbose messages for several subsystems.
# Warning, these may compile large string tables into the kernel!
options 	EISAVERBOSE	# verbose EISA device autoconfig messages
options 	PCIVERBOSE	# verbose PCI device autoconfig messages
#options 	PCMCIAVERBOSE	# verbose PCMCIA configuration messages
options 	SCSIVERBOSE	# human readable SCSI error messages
options 	USBVERBOSE	# verbose USB device autoconfig messages

options 	NFS_BOOT_BOOTP,NFS_BOOT_BOOTPARAM

#
# wscons options
#
# builtin terminal emulations
#options 	WSEMUL_SUN		# sun terminal emulation
options 	WSEMUL_VT100		# VT100 / VT220 emulation
# different kernel output - see dev/wscons/wsdisplayvar.h
options 	WS_KERNEL_FG=WSCOL_GREEN
# compatibility to other console drivers
options 	WSDISPLAY_COMPAT_PCVT		# emulate some ioctls
options 	WSDISPLAY_COMPAT_SYSCONS	# emulate some ioctls
options 	WSDISPLAY_COMPAT_USL		# VT handling
options 	WSDISPLAY_COMPAT_RAWKBD		# can get raw scancodes
# see dev/pckbc/wskbdmap_mfii.c for implemented layouts
#options 	PCKBD_LAYOUT="(KB_DE | KB_NODEAD)"
# allocate a number of virtual screens at autoconfiguration time
#options 	WSDISPLAY_DEFAULTSCREENS=4

# Kernel root file system and dump configuration.
config		netbsd	root on ? type ?
#config		netbsd	root on sd0a type ffs
#config		netbsd	root on ? type nfs

#
# Device configuration
#

mainbus0 at root

#apm0	at mainbus0			# Advanced power management


# Basic Bus Support

# PCI bus support
pci*	at mainbus? bus ?
pci*	at pchb? bus ?
pci*	at ppb? bus ?

# PCI bridges
pchb*	at pci? dev ? function ?	# PCI-Host bridges
pceb*	at pci? dev ? function ?	# PCI-EISA bridges
pcib*	at pci? dev ? function ?	# PCI-ISA bridges
ppb*	at pci? dev ? function ?	# PCI-PCI bridges
# XXX 'puc's aren't really bridges, but there's no better place for them here
puc*	at pci? dev ? function ?	# PCI "universal" comm. cards

# EISA bus support
eisa*	at mainbus?
eisa*	at pceb?

# ISA bus support
isa*	at mainbus?
isa*	at pceb?
isa*	at pcib?

# PCMCIA bus support
pcmcia*	at pcic? controller ? socket ?
pcmcia*	at tcic? controller ? socket ?

# ISA PCMCIA controllers
pcic0	at isa? port 0x3e0 iomem 0xd0000 iosiz 0x4000
pcic1	at isa? port 0x3e2 iomem 0xd4000 iosiz 0x4000
tcic0	at isa? port 0x240 iomem 0xd0000 iosiz 0x4000

# PCI PCMCIA controllers
pcic0	at pci? dev? function ?

# ISA Plug-and-Play bus support
isapnp0	at isa?

# ISA Plug-and-Play PCMCIA controllers
pcic*	at isapnp?

# Coprocessor Support

# Math Coprocessor support
npx0	at isa? port 0xf0 irq 13	# x86 math coprocessor


# Console Devices

# ISA console.  You can only configure one of these!
#pc0	at isa? port 0x60 irq 1		# pccons generic PC console driver
#vt0	at isa? port 0x60 irq 1		# PCVT console driver

# Keyboard layout configuration for pccons
#options 	FRENCH_KBD
#options 	FINNISH_KBD
#options 	GERMAN_KBD
#options 	NORWEGIAN_KBD

# wscons
pckbc0	at isa?			# pc keyboard controller
pckbd*	at pckbc?		# PC keyboard
# "opms" should not be enabled together with "pms" or "pmsi"
#pms*		at pckbc?		# PS/2 mouse for wsmouse
#pmsi*		at pckbc?	# PS/2 "Intelli"mouse for wsmouse
opms*		at pckbc?		# backwards compatible PS/2 mouse
vga0		at isa?
vga*		at pci?
pcdisplay0	at isa?			# CGA, MDA, EGA, HGA
wsdisplay*	at vga? console ?
wsdisplay*	at pcdisplay? console ?
wskbd*	at pckbd? console ?
#wsmouse*	at pms?
#wsmouse*	at pmsi?

pcppi0	at isa?
sysbeep0	at pcppi?

# Serial Devices

# PCI serial interfaces
com*	at puc? port ?			# 16x450s on "universal" comm boards
cy*	at pci? dev ? function ?	# Cyclades Cyclom-Y serial boards

# ISA Plug-and-Play serial interfaces
com*	at isapnp?			# Modems and serial boards

# PCMCIA serial interfaces
com*	at pcmcia? function ?		# Modems and serial cards

pcmcom*	at pcmcia? function ?		# PCMCIA multi-port serial cards
com*	at pcmcom? slave ?		# ...and the slave devices

# ISA serial interfaces
#options 	COM_HAYESP		# adds Hayes ESP serial board support
com0	at isa? port 0x3f8 irq 4	# Standard PC serial ports
com1	at isa? port 0x2f8 irq 3
com2	at isa? port 0x3e8 irq 5
#com3	at isa? port 0x2e8 irq 9
#ast0	at isa? port 0x1a0 irq 5	# AST 4-port serial cards
#com*	at ast? slave ?
#boca0	at isa? port 0x100 irq 5	# BOCA 8-port serial cards
#com*	at boca? slave ?
#tcom0	at isa? port 0x100 irq 7	# TC-800 8-port serial cards
#com*	at tcom? slave ?
#rtfps0	at isa? port 0x1230 irq 10	# RT 4-port serial cards
#com*	at rtfps? slave ?
#cy0	at isa? iomem 0xd4000 irq 12	# Cyclades serial cards


# Parallel Printer Interfaces

# PCI parallel printer interfaces
lpt*	at puc? port ?			# || ports on "universal" comm boards

# ISA parallel printer interfaces
# BROKEN_LPT_DELAY can fix hangs and reboots in interrupt driven lpt
#options 	BROKEN_LPT_DELAY=5
lpt0	at isa? port 0x378 irq 7	# standard PC parallel ports
lpt1	at isa? port 0x278
lpt2	at isa? port 0x3bc


# SCSI Controllers and Devices

# PCI SCSI controllers
adv*	at pci? dev ? function ?	# AdvanSys 1200[A,B], 9xx[U,UA] SCSI
adw*	at pci? dev ? function ?	# AdvanSys 9xxUW SCSI
ahc*	at pci? dev ? function ?	# Adaptec [23]94x, aic78x0 SCSI
bha*	at pci? dev ? function ?	# BusLogic 9xx SCSI
isp*	at pci? dev ? function ?	# Qlogic ISP [12]0x0 SCSI/FibreChannel
ncr*	at pci? dev ? function ?	# NCR 53c8xx SCSI
pcscp*	at pci? dev ? function ?	# AMD 53c974 PCscsi-PCI SCSI

# EISA SCSI controllers
ahb*	at eisa? slot ?			# Adaptec 174[02] SCSI
ahc*	at eisa? slot ?			# Adaptec 274x, aic7770 SCSI
bha*	at eisa? slot ?			# BusLogic 7xx SCSI
uha*	at eisa? slot ?			# UltraStor 24f SCSI

# PCMCIA SCSI controllers
aic*	at pcmcia? function ?		# Adaptec APA-1460 SCSI

# ISA Plug-and-Play SCSI controllers
aha*	at isapnp? 			# Adaptec AHA-154[02
aic*	at isapnp?			# Adaptec AHA-1520B

# ISA SCSI controllers
aha0	at isa? port 0x330 irq ? drq ?	# Adaptec 154[02] SCSI
aha1	at isa? port 0x334 irq ? drq ?
ahc0	at isa? port ? irq ?		# Adaptec 284x SCSI
aic0	at isa? port 0x340 irq 11	# Adaptec 152[02] SCSI
bha0	at isa? port 0x330 irq ? drq ?	# BusLogic [457]4X SCSI
bha1	at isa? port 0x334 irq ? drq ?
nca0	at isa? port 0x360 irq 15	# Port-mapped NCR 53C80 contoller
nca1	at isa? iomem 0xd8000 irq 5	# Memory-mapped controller (T128, etc.)
sea0	at isa? iomem 0xc8000 irq 5	# Seagate/Future Domain SCSI
uha0	at isa? port 0x330 irq ? drq ?	# UltraStor [13]4f SCSI
uha1	at isa? port 0x340 irq ? drq ?
wds0	at isa? port 0x350 irq 15 drq 6	# WD7000 and TMC-7000 controllers
wds1	at isa? port 0x358 irq 11 drq 5

# SCSI bus support
scsibus* at adv?
scsibus* at adw?
scsibus* at aha?
scsibus* at ahb?
scsibus* at ahc?
scsibus* at aic?
scsibus* at bha?
scsibus* at isp?
scsibus* at nca?
scsibus* at ncr?
scsibus* at pcscp?
scsibus* at sea?
scsibus* at uha?
scsibus* at wds?

# SCSI devices
sd*	at scsibus? target ? lun ?	# SCSI disk drives
st*	at scsibus? target ? lun ?	# SCSI tape drives
cd*	at scsibus? target ? lun ?	# SCSI CD-ROM drives
ch*	at scsibus? target ? lun ?	# SCSI autochangers
ss*	at scsibus? target ? lun ?	# SCSI scanners
uk*	at scsibus? target ? lun ?	# SCSI unknown


# IDE and related devices
# PCI IDE controllers - see pciide(4) for suppored hardware.
# The 0x0001 flag force the driver to use DMA, even if the driver doesn't know
# how to set up DMA modes for this chip. This may work, or may cause
# a machine hang with some controllers.
pciide* at pci ? dev ? function ? flags 0x0000

# ISA Plug-and-Play IDE controllers
wdc*	at isapnp? 

# PCMCIA IDE controllers
wdc*	at pcmcia? function ?

# ISA ST506, ESDI, and IDE controllers
wdc0	at isa? port 0x1f0 irq 14
wdc1	at isa? port 0x170 irq 15

# IDE drives
# Flags are used only with controllers that support DMA operations
# and mode settings (e.g. some pciide controllers)
# The lowest order four bits (rightmost digit) of the flags define the PIO
# mode to use, the next set of four bits the DMA mode and the third set the
# UltraDMA mode. For each set of four bits, the 3 lower bits define the mode
# to use, and the last bit must be 1 for this setting to be used.
# For DMA and UDMA, 0xf (1111) means 'disable'.
# 0x0fac means 'use PIO mode 4, DMA mode 2, disable UltraDMA'.
# (0xc=1100, 0xa=1010, 0xf=1111)
# 0x0000 means "use whatever the drive claims to support".
wd*	at wdc? channel ? drive ? flags 0x0000
wd*	at pciide? channel ? drive ? flags 0x0000

# ATAPI bus support
atapibus* at wdc? channel ?
atapibus* at pciide? channel ?

# ATAPI devices
# flags have the same meaning as for IDE drives.
cd*	at atapibus? drive ? flags 0x0000	# ATAPI CD-ROM drives
sd*	at atapibus? drive ? flags 0x0000	# ATAPI disk drives
uk*	at atapibus? drive ? flags 0x0000	# ATAPI unknown


# Miscellaneous mass storage devices

# ISA floppy
fdc0	at isa? port 0x3f0 irq 6 drq 2	# standard PC floppy controllers
#fdc1	at isa? port 0x370 irq ? drq ?
fd*	at fdc? drive ?			# the drives themselves
# some machines need you to do this instead of fd*
#fd0	at fdc0 drive 0

# ISA CD-ROM devices
#mcd0	at isa? port 0x300 irq 10	# Mitsumi CD-ROM drives

# ISA tape devices
# note: the wt driver conflicts unpleasantly with SMC boards at the
# same I/O address. The probe reprograms their EEPROMs. Don't
# uncomment it unless you are actually using it.
#wt0	at isa? port 0x308 irq 5 drq 1	# Archive and Wangtek QIC tape drives


# Network Interfaces

# PCI network interfaces
de*	at pci? dev ? function ?	# DEC 21x4x-based Ethernet
en*	at pci? dev ? function ?	# ENI/Adaptec ATM
ep*	at pci? dev ? function ?	# 3Com 3c59x
ex*	at pci? dev ? function ?	# 3Com 90x[B]
epic*	at pci? dev ? function ?	# SMC EPIC/100 Ethernet
esh*	at pci? dev ? function ?	# Essential HIPPI card
fpa*	at pci? dev ? function ?	# DEC DEFPA FDDI
fxp*	at pci? dev ? function ?	# Intel EtherExpress PRO 10+/100B
le*	at pci? dev ? function ?	# PCnet-PCI Ethernet
ne*	at pci? dev ? function ?	# NE2000-compatible Ethernet
tl*	at pci? dev ? function ?	# ThunderLAN-based Ethernet
vr*	at pci? dev ? function ?	# VIA Rhine Fast Ethernet
lmc*	at pci? dev ? function ?	# Lan Media Corp SSI/HSSI/DS3

# EISA network interfaces
ep*	at eisa? slot ?			# 3Com 3c579 Ethernet
fea*	at eisa? slot ?			# DEC DEFEA FDDI

# ISA Plug-and-Play network interfaces
ep*	at isapnp?			# 3Com 3c509 Ethernet
ne*	at isapnp?			# NE2000-compatible Ethernet
tr*	at isapnp?			# IBM/3COM TROPIC Token-Ring

# PCMCIA network interfaces
ep*	at pcmcia? function ?		# 3Com 3c589 and 3c562 Ethernet
mbe*	at pcmcia? function ?		# MB8696x based Ethernet
ne*	at pcmcia? function ?		# NE2000-compatible Ethernet
sm*	at pcmcia? function ?		# Megahertz Ethernet

# ISA network interfaces
ate0	at isa? port 0x2a0 irq ?		# AT1700
cs0	at isa? port 0x300 iomem ? irq ? drq ?	# CS8900 Ethernet
ec0	at isa? port 0x250 iomem 0xd8000 irq 9	# 3Com 3c503 Ethernet
eg0	at isa? port 0x280 irq 9		# 3C505 ethernet cards
el0	at isa? port 0x300 irq 9		# 3C501 ethernet cards
ep0	at isa? port ? irq ?			# 3C509 ethernet cards
ef0	at isa? port 0x360 iomem 0xd0000 irq 7	# 3C507
ai0	at isa? port 0x360 iomem 0xd0000 irq 7	# StarLAN
fmv0	at isa? port 0x2a0 irq ?		# FMV-180 series
ix0	at isa? port 0x300 irq 10		# EtherExpress/16
iy0	at isa? port 0x360 irq ?		# EtherExpress PRO 10 ISA
lc0	at isa? port 0x320 iomem ? irq ?	# DEC EtherWORKS III (LEMAC)
#depca0	at isa? port 0x300 iomem 0xc8000 iosiz 0x8000 irq 5	# DEPCA
#le*	at depca?
nele0	at isa? port 0x320 irq 9 drq 7		# NE2100
le*	at nele?
bicc0	at isa? port 0x320 irq 10 drq 7		# BICC IsoLan
le*	at bicc?
ne0	at isa? port 0x280 irq 9		# NE[12]000 ethernet cards
ne1	at isa? port 0x300 irq 10
sm0	at isa? port 0x300 irq 10		# SMC91C9x Ethernet
tr0	at isa? port 0xa20 iomem 0xd8000 irq ?  # IBM TROPIC based Token-Ring
tr1	at isa? port 0xa24 iomem 0xd0000 irq ?  # IBM TROPIC based Token-Ring
tr*	at isa? port ? irq ?			# 3COM TROPIC based Token-Ring
we0	at isa? port 0x280 iomem 0xd0000 irq 9	# WD/SMC Ethernet
we1	at isa? port 0x300 iomem 0xcc000 irq 10

# MII/PHY support
exphy*	at mii? phy ?			# 3Com internal PHYs
icsphy*	at mii? phy ?			# Integrated Circuit Systems ICS1890
inphy*	at mii? phy ?			# Intel 82555 PHYs
lxtphy*	at mii? phy ?			# Level One LXT-970 PHYs
nsphy*	at mii? phy ?			# NS83840 PHYs
qsphy*	at mii? phy ?			# Quality Semiconductor QS6612 PHYs
sqphy*	at mii? phy ?			# Seeq 80220/80221/80223 PHYs
tlphy*	at mii? phy ?			# ThunderLAN PHYs
ukphy*	at mii? phy ?			# generic unknown PHYs

# USB Controller and Devices

# PCI USB controllers
uhci*	at pci?				# Universal Host Controller (Intel)
ohci*	at pci?				# Open Host Controller

# USB bus support
usb*	at uhci?
usb*	at ohci?

# USB Hubs
uhub*	at usb?
uhub*	at uhub? port ? configuration ? interface ?

# USB Mice
ums*	at uhub? port ? configuration ? interface ?
wsmouse*	at ums?

# USB Keyboards
ukbd*	at uhub? port ? configuration ? interface ?
wskbd*	at ukbd? console ?

# USB Generic HID devices
uhid*	at uhub? port ? configuration ? interface ?

# USB Printer
ulpt*	at uhub? port ? configuration ? interface ?

# USB Generic driver
ugen*	at uhub? port ? configuration ? interface ?

# Audio Devices

# PCI audio devices
eap*	at pci? dev ? function ?	# Ensoniq AudioPCI
sv*	at pci? dev ? function ?	# S3 SonicVibes

# ISA Plug-and-Play audio devices
ess*	at isapnp?			# ESS Tech ES1887, ES1888, ES888 audio
guspnp*	at isapnp?			# Gravis Ultra Sound PnP audio
sb*	at isapnp?			# SoundBlaster-compatible audio
wss*	at isapnp?			# Windows Sound System
ym*	at isapnp?			# Yamaha OPL3-SA3 audio

# ISA audio devices
aria0	at isa? port 0x290 irq 10 		# Aria
gus0	at isa? port 0x220 irq 7 drq 1 drq2 6	# Gravis Ultra Sound
pas0	at isa? port 0x220 irq 7 drq 1		# ProAudio Spectrum
pss0	at isa? port 0x220 irq 7 drq 6  	# Personal Sound System
sp0	at pss0 port 0x530 irq 10 drq 0		# 	sound port driver
sb0	at isa? port 0x220 irq 5 drq 1 drq2 5	# SoundBlaster
wss0	at isa? port 0x530 irq 10 drq 0	drq2 1	# Windows Sound System

# OPL[23] FM syntheziers
#opl0	at isa? port 0x388	# use only if not attached to sound card
opl*	at ess?
opl*	at sb?
opl*	at sv?

# USB Audio devices
#uaudio*	at uhub? port ? configuration ? interface ?

# Audio support
audio*	at aria?
audio*	at eap?
audio*	at ess?
audio*	at gus?
audio*	at guspnp?
audio*	at pas?
audio*	at sb?
audio*	at sp?
audio*	at sv?
#audio*	at uaudio?
audio*	at wss?
audio*	at ym?

# MIDI support
midi*	at pcppi?		# MIDI interface to the PC speaker
midi*	at sb?			# SB MPU401 port
midi*	at opl?			# OPL FM synth

# The spkr driver provides a simple tone interface to the built in speaker.
#spkr0	at pcppi?		# PC speaker


# Mice

# ISA busmice
#lms0	at isa? port 0x23c irq 5	# Logitech bus mouse
#lms1	at isa? port 0x238 irq 5
#mms0	at isa? port 0x23c irq 5	# Microsoft InPort mouse
#mms1	at isa? port 0x238 irq 5
#wsmouse*	at lms?
#wsmouse*	at mms?
# backwards compatible versions
olms0	at isa? port 0x23c irq 5	# Logitech bus mouse
olms1	at isa? port 0x238 irq 5
omms0	at isa? port 0x23c irq 5	# Microsoft InPort mouse
omms1	at isa? port 0x238 irq 5
#opms0	at pc? irq 12		# PS/2 auxiliary port mouse
#opms0	at vt? irq 12		# PS/2 auxiliary port mouse


# Joysticks

# ISA Plug-and-Play joysticks
joy*	at isapnp?			# Game ports (usually on audio cards)

# ISA joysticks. Probe is a little strange; add only if you have one.
#joy0	at isa? port 0x201


# Miscellaneous Devices

# Planetconnect Satellite receiver driver.
#satlink0 at isa? port 0x300 drq 1


# Pull in optional local configuration
include	"arch/i386/conf/GENERIC.local"


# Pseudo-Devices

# disk/mass storage pseudo-devices
pseudo-device	ccd		4	# concatenated/striped disk devices
#pseudo-device	raid		4	# RAIDframe disk driver
#pseudo-device	md		1	# memory disk device (ramdisk)
#pseudo-device	vnd		4	# disk-like interface to files

# network pseudo-devices
pseudo-device	bpfilter	8	# Berkeley packet filter
#pseudo-device	ipfilter		# IP filter (firewall) and NAT
pseudo-device	loop			# network loopback
#pseudo-device	ppp		2	# Point-to-Point Protocol
#pseudo-device	sl		2	# Serial Line IP
#pseudo-device	strip		2	# Starmode Radio IP (Metricom)
#pseudo-device	tun		2	# network tunneling over tty
#pseudo-device	gre		2	# generic L3 over IP tunnel
#pseudo-device	ipip		2	# IP Encapsulation within IP (RFC 2003)

# miscellaneous pseudo-devices
pseudo-device	pty		64	# pseudo-terminals
#pseudo-device	tb		1	# tablet line discipline
#pseudo-device	sequencer	1	# MIDI sequencer

# rnd is EXPERIMENTAL at this point.
#pseudo-device	rnd			# /dev/random and in-kernel generator
#options 	RND_COM			# use "com" randomness as well (BROKEN)

# a pseudo device needed for Coda	# also needs CODA (above)
#pseudo-device	vcoda		4	# coda minicache <-> venus comm.

>How-To-Repeat:

>Fix:
	
>Audit-Trail:
>Unformatted: