HTT/SMP does not start 2nd processor

[Bosko Milekic]

Make sure the acpi kernel module is being loaded on startup.  See
acpi(4).

-Bosko

On Tue, May 10, 2005 at 04:57:47PM +0100, Pete French wrote:
> I have two P4 machines here, both with processors supporting hyperthreading,
> and running identical SMP kernels from 5.4-RELEASE. One runs with two
> logical processors and the oother doesn't. This has been puzlling me all day.
> 
> On the machine where the second CPU does not start up, HTTP is
> enabled in the BIOS, and I get the following in dmesg:
> 
> CPU: Intel(R) Pentium(R) 4 CPU 3.00GHz (2992.52-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,C
> MOV,PAT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE>
>   Hyperthreading: 2 logical CPUs
> real memory  = 536739840 (511 MB)
> avail memory = 515579904 (491 MB)
> MPTable: <COMPAQ   Workstation >
> ioapic0: Changing APIC ID to 1
> ioapic0: Assuming intbase of 0
> ioapic0 <Version 2.0> irqs 0-23 on motherboard
> 
> On the one which starts up the 2nd CPU the equivalent part is:
> 
> CPU: Intel(R) Xeon(TM) CPU 2.40GHz (2392.04-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,C
> MOV,PAT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE>
>   Hyperthreading: 2 logical CPUs
> real memory  = 536301568 (511 MB)
> avail memory = 515137536 (491 MB)
> ACPI APIC Table: <DELL   WS 450 >
> FreeBSD/SMP: Multiprocessor System Detected: 2 CPUs
>  cpu0 (BSP): APIC ID:  0
>  cpu1 (AP): APIC ID:  1
> ioapic0: Changing APIC ID to 8
> ioapic1: Changing APIC ID to 9
> ioapic2: Changing APIC ID to 10
> 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
> 
> So both are reporting 2 logical CPU's, but only the second is then
> detecting this as a multiprocessor system. I notice that one syas
> it is using an ACPI APIC table and the other (that does not start) is
> just finding an MPTable. That seems to be the difference between them.
> 
> Does anyone have any suggestions ? I dont really understand how this
> stuff is detected, so I am not sure how to sart digging into this. It
> is obviously finding a dual CPU processor, so why isn't it then detecting
> it as a multiprocessor system ?
> 
> *puzzled*
> 
> -pcf.
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-- 
Bosko Milekic
bmilekic at technokratis.com
bmilekic at FreeBSD.org