SMP interrupt problem

[Rob]

Hi,

I have a system with two dual core CPUS. I have installed 6.3 release and have 
the SMP kernel running.

FreeBSD 6.3-RELEASE #0: Wed Jan 16 04:45:45 UTC 2008
     root at dessler.cse.buffalo.edu:/usr/obj/usr/src/sys/SMP
Timecounter "i8254" frequency 1193182 Hz quality 0
CPU: Intel(R) Xeon(TM) CPU 2.80GHz (2799.22-MHz 686-class CPU)
   Origin = "GenuineIntel"  Id = 0xf29  Stepping = 9
 
Features=0xbfebfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE>
   Features2=0x4400<CNXT-ID,xTPR>
   Logical CPUs per core: 2
real memory  = 1073676288 (1023 MB)
avail memory = 1037307904 (989 MB)
ACPI APIC Table: <A M I  OEMAPIC >
FreeBSD/SMP: Multiprocessor System Detected: 4 CPUs
  cpu0 (BSP): APIC ID:  0
  cpu1 (AP): APIC ID:  1
  cpu2 (AP): APIC ID:  6
  cpu3 (AP): APIC ID:  7
MADT: Forcing active-low polarity and level trigger for SCI
ioapic0 <Version 2.0> irqs 0-23 on motherboard
ioapic1 <Version 2.0> irqs 24-47 on motherboard
ioapic2 <Version 2.0> irqs 48-71 on motherboard
kbd1 at kbdmux0
ath_hal: 0.9.20.3 (AR5210, AR5211, AR5212, RF5111, RF5112, RF2413, RF5413)
hptrr: HPT RocketRAID controller driver v1.1 (Jan 16 2008 04:43:12)
acpi0: <A M I OEMRSDT> on motherboard
acpi0: Power Button (fixed)
Timecounter "ACPI-fast" frequency 3579545 Hz quality 1000
acpi_timer0: <24-bit timer at 3.579545MHz> port 0x408-0x40b on acpi0
cpu0: <ACPI CPU> on acpi0
acpi_throttle0: <ACPI CPU Throttling> on cpu0
cpu1: <ACPI CPU> on acpi0
cpu2: <ACPI CPU> on acpi0
cpu3: <ACPI CPU> on acpi0
pcib0: <ACPI Host-PCI bridge> port 0xcf8-0xcff on acpi0
pci0: <ACPI PCI bus> on pcib0
pcib1: <ACPI PCI-PCI bridge> at device 2.0 on pci0
pci2: <ACPI PCI bus> on pcib1
pcib2: <ACPI PCI-PCI bridge> at device 29.0 on pci2
pci4: <ACPI PCI bus> on pcib2
..
..
..
Timecounters tick every 1.000 msec
hptrr: no controller detected.
ad0: 76319MB <WDC WD800JB-00FSA0 77.07W77> at ata0-master UDMA100
SMP: AP CPU #1 Launched!
SMP: AP CPU #2 Launched!
SMP: AP CPU #3 Launched!

Once it is running it seems to just be busy doing interrupts.

When "idle" top -C -S shows:

last pid:   811;  load averages:  1.00,  0.67,  0.31    up 0+00:04:24  07:32:53
65 processes:  6 running, 43 sleeping, 16 waiting
CPU states:  0.0% user,  0.0% nice,  0.0% system, 43.6% interrupt, 56.4% idle
Mem: 7376K Active, 4768K Inact, 18M Wired, 8336K Buf, 963M Free
Swap: 1024M Total, 1024M Free

   PID USERNAME  THR PRI NICE   SIZE    RES STATE  C   TIME    CPU COMMAND
    13 root        1 171   52     0K     8K RUN    0   3:43 99.02% idle: cpu0
    23 root        1 -52 -171     0K     8K CPU2   2   2:51 85.11% irq9: acpi0
    11 root        1 171   52     0K     8K RUN    2   0:55 12.89% idle: cpu2
    37 root        1 171   52     0K     8K pgzero 0   0:00  0.00% pagezero
    15 root        1 -32 -151     0K     8K WAIT   0   0:00  0.00% swi4: clock s
     0 root        1  96    0     0K     0K WAIT   1   0:00  0.00% swapper
     4 root        1  -8    0     0K     8K -      0   0:00  0.00% g_down
     3 root        1  -8    0     0K     8K -      0   0:00  0.00% g_up

If anyone has an idea what the problem is I would be grateful for any advice.

Regards,

Rob