and Fedora 9 with kernel 2.6.25.3-18.fc9.i686.[...]
I see this in dmesg:
CPU 1 irqstacks, hard=c07ba000 soft=c079a000
Not responding.
Inquiring remote APIC #1...
... APIC #1 ID: failed
... APIC #1 VERSION: failed
... APIC #1 SPIV: failed
CPU #1 not responding - cannot use it.
Booting processor 1/2 ip 4000
Not responding.
Inquiring remote APIC #2...
... APIC #2 ID: failed
... APIC #2 VERSION: failed
... APIC #2 SPIV: failed
CPU #2 not responding - cannot use it.
Booting processor 1/3 ip 4000
Not responding.
Inquiring remote APIC #3...
... APIC #3 ID: failed
... APIC #3 VERSION: failed
... APIC #3 SPIV: failed
CPU #3 not responding - cannot use it.
Total of 1 processors activated (5015.39 BogoMIPS).
ENABLING IO-APIC IRQs
..TIMER: vector=0x31 apic1=0 pin1=2 apic2=-1 pin2=-1
Brought up 1 CPUs