Below is my FreeBSD 7.0 kernel configuration file.  I created it on my reference system, to be used on four production servers whose hardware configurations differ some.  For that reason there’re few options (indicated as “[OPTION]“) that are conditional for the configurations. I’ve also left in IPv6 options which are currently commented out, but that I may take into use later if/when IPv6 becomes more prevalent in the environment these servers operate.

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#
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# INERTIA -- Inertia kernel configuration file for FreeBSD/i386
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#
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# For more information on this file, please read the handbook section on
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# Kernel Configuration Files:
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#
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#    http://www.FreeBSD.org/doc/en_US.ISO8859-1/books/handbook/kernelconfig-config.html
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#
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# The handbook is also available locally in /usr/share/doc/handbook
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# if you've installed the doc distribution, otherwise always see the
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# FreeBSD World Wide Web server (http://www.FreeBSD.org/) for the
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# latest information.
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#
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# An exhaustive list of options and more detailed explanations of the
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# device lines is also present in the ../../conf/NOTES and NOTES files.
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# If you are in doubt as to the purpose or necessity of a line, check first
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# in NOTES.
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#
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# Based on
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# $FreeBSD: src/sys/i386/conf/GENERIC,v 1.474.2.2.2.1 2008/02/06 03:24:28 scottl Exp $
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ident		INERTIA
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machine		i386
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cpu		I686_CPU
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options		SMP 			# Symmetric MultiProcessor Kernel (`device apic' is also required for multiprocessor use)
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options 	SCHED_4BSD		# 4BSD scheduler
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options 	PREEMPTION		# Enable kernel thread preemption
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options 	INET			# InterNETworking
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#options 	INET6			# IPv6 communications protocols
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options 	FFS			# Berkeley Fast Filesystem
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options 	SOFTUPDATES		# Enable FFS soft updates support
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options 	UFS_ACL			# Support for access control lists
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options 	UFS_DIRHASH		# Improve performance on big dirs
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options 	CD9660			# ISO 9660 Filesystem
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options 	PROCFS			# Process filesystem (requires PSEUDOFS)
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options 	PSEUDOFS		# Pseudo-filesystem framework
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options		MSDOSFS			# MSDOS filesystem support (for floppies)
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options 	COMPAT_43		# Compatible with BSD 4.3 (required)
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options 	COMPAT_FREEBSD4		# Compatible with FreeBSD4
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options 	COMPAT_FREEBSD5		# Compatible with FreeBSD5
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options 	COMPAT_FREEBSD6		# Compatible with FreeBSD6
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options 	SCSI_DELAY=15000	# Delay (in ms) before probing SCSI (TWA/TWE issue)
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options 	KTRACE			# ktrace(1) support
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options 	SYSVSHM			# SYSV-style shared memory
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options 	SYSVMSG			# SYSV-style message queues
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options 	SYSVSEM			# SYSV-style semaphores
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options 	_KPOSIX_PRIORITY_SCHEDULING # POSIX P1003_1B real-time extensions
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options 	KBD_INSTALL_CDEV	# install a CDEV entry in /dev, may be needed to hot-plug USB keyboards
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options 	AHC_REG_PRETTY_PRINT	# Print register bitfields in debug output
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options 	AHD_REG_PRETTY_PRINT	# Print register bitfields in debug output
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options 	ADAPTIVE_GIANT		# Giant mutex is adaptive
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options		ACCEPT_FILTER_HTTP	# Must be here or AcceptFilter won't work w/Apache2
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options		SC_DISABLE_REBOOT	# Disable Ctrl-Alt-Del reboot (this is a server)
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device		apic			# I/O APIC (required)
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device		npx   			# The Numeric Processing eXtension driver (required)
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device		pci
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device		isa			# Required by npx
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device		fdc			# Floppy drives
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device		ata			# ATA and ATAPI devices
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device		atadisk			# ATA disk drives
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device		ataraid			# ATA RAID drives [OPTION]
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device		atapicd			# ATAPI CDROM drives
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options 	ATA_STATIC_ID		# Static device numbering
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device		scbus			# SCSI bus (required for SCSI, ALSO REQ'D FOR SATA-RAID, USB/umass)
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device		da			# Direct Access (disks)
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device		pass			# Passthrough device (direct SCSI access)
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#device		twe			# 3ware ATA RAID [OPTION]
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#device		twa			# 3ware 9000 series PATA/SATA RAID [OPTION]
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#options	TWA_DEBUG		# 0-10; 10 prints the most messages; enable for twa debug only
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device		atkbdc			# AT keyboard controller
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device		atkbd			# AT keyboard
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device		kbdmux			# keyboard multiplexer
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device		vga			# VGA video card driver
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device		sc			# syscons, the default console driver
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device		sio			# 8250, 16[45]50 based serial ports
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device		ppc			# Parallel port
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device		ppbus			# Parallel port bus (required)
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device		lpt			# Printer
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device		ppi			# Parallel port interface device
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#device		miibus			# MII bus support (required by some NICs) [OPTION]
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#device		fxp			# Intel EtherExpress PRO/100B (82557, 82558); requires miibus [OPTION]
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device		em			# Intel PRO/1000 adapter Gigabit Ethernet Card [OPTION]
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options		DEVICE_POLLING		# Imporoves network driver performance
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device		coretemp		# On-die temperature sensor on Intel Core and newer CPUs [OPTION]
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device		loop			# Network loopback
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device		random			# Entropy device
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device		ether			# Ethernet support
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device		pty			# Pseudo-ttys (telnet etc)
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#device		gif			# IPv6 and IPv4 tunneling
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#device		faith			# IPv6-to-IPv4 relaying (translation)
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device		bpf			# Berkeley packet filter
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# USB support [OPTION]
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device		uhci			# USB support / UHCI PCI->USB interface
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device		ohci			# USB support / OHCI PCI->USB interface
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device		ehci			# USB support / EHCI PCI->USB interface (USB 2.0)
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device		usb			# USB support / USB Bus (required)
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device		ugen			# USB support / Generic
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device		uhid			# USB support / "Human Interface Devices"
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device		ukbd			# USB support / Keyboard
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device		umass			# USB support / Disks/Mass storage - Requires scbus and da
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options		COMPAT_LINUX		# Linux compat / Enable Linux ABI emulation
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options		COMPAT_AOUT		# Linux compat / Enable i386 a.out binary support
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options		LINPROCFS		# Linux compat / Enable procfs support (COMPAT_LINUX / PSEUDOFS)
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