enabling SMP

Thu Sep 13 04:52:17 PDT 2007

I've just got a new box, an HP DC5750 with an Athlon X2 3800 but I
can't get SMP working. It *was* cheap :)

My kernel config:

machine		i386
cpu		I686_CPU
ident		MELON_SMP

# To statically compile in device wiring instead of /boot/device.hints
#hints		"GENERIC.hints"		# Default places to look for devices.

#makeoptions	DEBUG=-g		# Build kernel with gdb(1) debug symbols

#options 	SCHED_ULE		# ULE scheduler
options 	SMP
options 	SCHED_4BSD		# 4BSD scheduler
options 	PREEMPTION		# Enable kernel thread preemption
options 	INET			# InterNETworking
options 	INET6			# IPv6 communications protocols
options 	FFS			# Berkeley Fast Filesystem
options 	SOFTUPDATES		# Enable FFS soft updates support
options 	UFS_ACL			# Support for access control lists
options 	UFS_DIRHASH		# Improve performance on big directories
options 	MD_ROOT			# MD is a potential root device
options 	NFSCLIENT		# Network Filesystem Client
options 	NFSSERVER		# Network Filesystem Server
options 	NFS_ROOT		# NFS usable as /, requires NFSCLIENT
options 	MSDOSFS			# MSDOS Filesystem
options 	CD9660			# ISO 9660 Filesystem
options 	PROCFS			# Process filesystem (requires PSEUDOFS)
options 	PSEUDOFS		# Pseudo-filesystem framework
options 	GEOM_GPT		# GUID Partition Tables.
options 	COMPAT_43		# Compatible with BSD 4.3 [KEEP THIS!]
options 	COMPAT_FREEBSD4		# Compatible with FreeBSD4
options 	COMPAT_FREEBSD5		# Compatible with FreeBSD5
options 	SCSI_DELAY=5000		# Delay (in ms) before probing SCSI
options 	KTRACE			# ktrace(1) support
options 	SYSVSHM			# SYSV-style shared memory
options 	SYSVMSG			# SYSV-style message queues
options 	SYSVSEM			# SYSV-style semaphores
options 	_KPOSIX_PRIORITY_SCHEDULING # POSIX P1003_1B real-time extensions
options 	KBD_INSTALL_CDEV	# install a CDEV entry in /dev
options 	AHC_REG_PRETTY_PRINT	# Print register bitfields in debug
					# output.  Adds ~128k to driver.
options 	AHD_REG_PRETTY_PRINT	# Print register bitfields in debug
					# output.  Adds ~215k to driver.
options 	ADAPTIVE_GIANT		# Giant mutex is adaptive.

device		apic			# I/O APIC

# Bus support.
device		pci

# Floppy drives
device		fdc

# ATA and ATAPI devices
device		ata
device		atadisk		# ATA disk drives
device		ataraid		# ATA RAID drives
device		atapicd		# ATAPI CDROM drives
device		atapifd		# ATAPI floppy drives
device		atapist		# ATAPI tape drives
options 	ATA_STATIC_ID	# Static device numbering

#scsi (iPod)
device		scbus
device		da
device		cd
device		pass

# atkbdc0 controls both the keyboard and the PS/2 mouse
device		atkbdc		# AT keyboard controller
device		atkbd		# AT keyboard
device		psm		# PS/2 mouse

device		vga		# VGA video card driver

#device		splash		# Splash screen and screen saver support

# syscons is the default console driver, resembling an SCO console
device		sc

# Enable this for the pcvt (VT220 compatible) console driver
#device		vt
#options 	XSERVER		# support for X server on a vt console
#options 	FAT_CURSOR	# start with block cursor

#device		agp		# support several AGP chipsets

# Power management support (see NOTES for more options)
#device		apm
# Add suspend/resume support for the i8254.
#device		pmtimer

# Serial (COM) ports
device		sio		# 8250, 16[45]50 based serial ports

# Parallel port
device		ppc
device		ppbus		# Parallel port bus (required)
device		lpt		# Printer
#device		plip		# TCP/IP over parallel
#device		ppi		# Parallel port interface device
#device		vpo		# Requires scbus and da

# PCI Ethernet NICs that use the common MII bus controller code.
# NOTE: Be sure to keep the 'device miibus' line in order to use these NICs!
device		miibus		# MII bus support
device		xl		# 3Com 3c90x (``Boomerang'', ``Cyclone'')
device          bge             # Broadcom BCM570xx Gigabit Ethernet

# Pseudo devices.
device		loop		# Network loopback
device		random		# Entropy device
device		ether		# Ethernet support
#device		sl		# Kernel SLIP
#device		ppp		# Kernel PPP
device		tun		# Packet tunnel.
device		pty		# Pseudo-ttys (telnet etc)
device		md		# Memory "disks"
device		gif		# IPv6 and IPv4 tunneling
device		faith		# IPv6-to-IPv4 relaying (translation)

# The `bpf' device enables the Berkeley Packet Filter.
# Be aware of the administrative consequences of enabling this!
# Note that 'bpf' is required for DHCP.
device		bpf		# Berkeley packet filter

# USB support
device		uhci		# UHCI PCI->USB interface
device		ohci		# OHCI PCI->USB interface
device		ehci		# EHCI PCI->USB interface (USB 2.0)
device		usb		# USB Bus (required)
#device		udbp		# USB Double Bulk Pipe devices
device		ugen		# Generic
device		uhid		# "Human Interface Devices"
device		ukbd		# Keyboard
device		ulpt		# Printer
device		umass		# Disks/Mass storage - Requires scbus and da
device		ums		# Mouse
#device		ural		# Ralink Technology RT2500USB wireless NICs
device		urio		# Diamond Rio 500 MP3 player
#device		uscanner	# Scanners

In make.conf I've got:

CPUTYPE?=athlon-mp

I've had problems getting ACPCI working, I just get a panic, so I'm
booting with it disabled. 

$ sysctl -a | grep cpu

kern.threads.virtual_cpu: 1
kern.ccpu: 1948
kern.sched.ipiwakeup.onecpu: 0
kern.smp.cpus: 1
kern.smp.maxcpus: 16
debug.cpufreq.verbose: 0
debug.cpufreq.lowest: 0
debug.kdb.stop_cpus: 1
debug.PMAP1changedcpu: 0
hw.ncpu: 1
machdep.cpu_idle_hlt: 1
machdep.hlt_cpus: 0
dev.cpu.0.%driver: cpu
dev.cpu.0.%parent: legacy0

and the relevant section from dmesg:

Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993, 1994
        The Regents of the University of California. All rights reserved.
FreeBSD is a registered trademark of The FreeBSD Foundation.
FreeBSD 6.2-STABLE #0: Thu Sep 13 02:47:10 BST 2007
    root at melon.esperance-linux.co.uk:/usr/obj/usr/src/sys/MELON_SMP
Timecounter "i8254" frequency 1193182 Hz quality 0
CPU: AMD Athlon(tm) 64 X2 Dual Core Processor 3800+ (1995.02-MHz 686-class CPU)
  Origin = "AuthenticAMD"  Id = 0x40fb2  Stepping = 2
  Features=0x178bfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CLFLUSH,MMX,FXSR,SSE,SSE2,HTT>
  Features2=0x2001<SSE3,CX16>
  AMD Features=0xea500800<SYSCALL,NX,MMX+,FFXSR,RDTSCP,LM,3DNow+,3DNow>
  AMD Features2=0x1f<LAHF,CMP,<b2>,<b3>,CR8>
  Cores per package: 2
real memory  = 803561472 (766 MB)
avail memory = 776843264 (740 MB)
cpu0 on motherboard

Nothing else about CPUs in dmesg.

I had to bodge loader.conf to get more than 64MB working:

hw.physmem="803561472"

and I'm wondering if I need another bodge to get SMP working.

Hope you can help! TIA

BTW, I compiled STABLE with <64MB which I thought was fairly
impressive. It wasn't overly slow either.

-- 

 Frank 

 Contact info: http://www.esperance-linux.co.uk/misc/contact.html 