The APIC table configuration is usually read  
from the BIOS or EFI or ... and lets the kernel
know how the interrupts on the machine are 
configured. The APIC table in the BIOS has to 
reflect the motherboard, slot and processor 
configuration. As the problem has just started 
with this version of SL, it might be fixed in a 
later version of the BIOS. However, as a word of 
warning, we tried this on a particular server 
and ended up with a different issue. Resulting 
in having to back out the latest BIOS and also
use noapic.

- Nick

>-----Original Message-----
>From: [log in to unmask]
>[mailto:[log in to unmask]]On Behalf Of
>Michael Mansour
>Sent: 27 September 2006 11:25
>To: Jeremy Sanders; [log in to unmask]
>Subject: Re: APIC errors
>
>
>Hi,
>
>> With the latest SL kernel, kernel-2.6.9-42.0.2.EL, we have a P4 
>> machine which has suddenly started printing out:
>> 
>> APIC error on CPU0: 60(60)
>> APIC error on CPU0: 60(60)
>> ...
>> 
>> This is the CPU:
>> 
>> processor       : 0
>> vendor_id       : GenuineIntel
>> cpu family      : 15
>> model           : 2
>> model name      : Intel(R) Pentium(R) 4 CPU 2.20GHz
>> stepping        : 4
>> cpu MHz         : 2200.079
>> 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 apic mtrr pge 
>> mca cmov patpse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm 
>> bogomips        : 4402.81
>> 
>> This is on an Intel D845EBG2 motherboard with the latest BIOS.
>> 
>> Has anyone seen anything similar? Does it matter, and is it worth 
>> fixing the problem with noapic or other options? I haven't seen any 
>> other problems with the system.
>
>I used to get these errors on a particular server all the 
>time, it was Dual
>AMD Athlon XP 2400+. They'd come up frequently, and then after 
>a few months
>the box would black screen and have to be cold booted.
>
>It would do this every 2-3 months, I could use noapic to turn 
>it off and not
>have problems with the server, but the server was used to 
>detect temperatures
>etc in the server room (at that time) so I lived with it.
>
>Michael.
>