Problem with SMP 2.4.21 on Compaq Prolian 1600

Linux SMP,
I've got a Compaq Proliant 1600-2xP3/500 machine that I cannot get SMP
to work correctly on. At one point I had Win2K Server on there, and that could see both processors. (We're migrating to Linux). So I installed Slackware 9.0 (my personal favourite distro), then did some updates. The 2.4.21 kernel was released (thank you) and I went to install. The current kernel 2.4.20 didn't have SMP enabled on that machine but I thought I'd try 2.4.21 with SMP. So I did, using menuconfig I enabled SMP (only one option right?) and then compiled the beast, config lilo and then thought I was good to go. Reboot was fine (after I remembered to include the PCI stuff that I forgot the first compile) but cannot see the 2nd processor. cat /proc/cpuinfo (below) only shows one CPU in the machine :[. Did I miss something in the menuconfig? I don't know where to even start troubleshooting this. I suppose I should also mention that I'm using the software raid1 and 5 and booting from the raid1 device (/dev/md0). Please advise.

root@mimir:~# cat /proc/cpuinfo
processor       : 0
vendor_id       : GenuineIntel
cpu family      : 6
model           : 7
model name      : Pentium III (Katmai)
stepping        : 2
cpu MHz         : 498.696
cache size      : 512 KB
fdiv_bug        : no
hlt_bug         : no
f00f_bug        : no
coma_bug        : no
fpu             : yes
fpu_exception   : yes
cpuid level     : 2
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 sep mtrr pge mca cmov
pat pse36 mmx fxsr sse
bogomips        : 996.14

root@mimir:~# cat /proc/mdstat
Personalities : [linear] [raid0] [raid1] [raid5]
read_ahead 1024 sectors
md0 : active raid1 sdb2[1] sda2[0]
      8360896 blocks [2/2] [UU]

md1 : active raid5 sde1[2] sdd1[1] sdc1[0]

      17772288 blocks level 5, 16k chunk, algorithm 0 [3/3] [UUU]

unused devices: <none>

root@mimir:~# cat /etc/lilo.conf
boot = /dev/md0
raid-extra-boot = "/dev/sda,/dev/sdb"
prompt
# Update this when you get this kernel working
# default = Linux_2.4.21
default = Linux_2.4.20
timeout = 60
change-rules
  reset
vga = normal
# 2.4.20
image = /boot/vmlinuz
  root = /dev/md0
  label = Linux_2.4.20
  read-only
# SMP 2.4.21
image = /boot/bzImage.2.4.21
  root = /dev/md0
  label = Linux_2.4.21
  read-only

David Busby
Systems Engineer
[email protected]