Re: An unexpected IO-APIC was found

On Fri, Mar 18, 2005 at 10:30:14AM +0000, Andrew Bird wrote:
> 	I have several Opteron boards of Tyan Thunder K8SR (S2881) type. They are 
> reporting 'An unexpected IO-APIC was found' when booted with kernel 2.4.29. I 
> am reporting this as asked to do in the machines messages file. The machines 
> are around 1 year old now so I expected them to be recognised by 2.4.29.

Randy Dunlap's boilerplate reply:

  These messages are informational only, they don't represent a
  problem when taken alone.

  More info:

  Several of these messages have been "fixed"
  in later versions of 2.4 and eliminated in Linux 2.6.
  They are informational only and don't affect the operations of Linux.

  They come from Linux having a known-valid list of IO APIC devices
  and that list not being updated very often (hence the message
  removal in Linux 2.6).

BTW, you should seriously consider running linux-2.6 on that board. 2.6
has better support for the x86_64 NUMA architecture, both the memory
manager and the scheduler know about it. Since september 2004 I've been
running 2.6.8.1 on a dual CPU 8GB Thunder K8W (S2885, more PCI slots
than an S2881, no on-board scsi controller) and unfortunately it went
down six days ago due to a power failure.


Erik

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