Re: Dual Processor

["Vladimir G. Ivanovic" <vladimir@acm.org>]

I recommend that you search the linux-smp archives or use a search
engine to look on the WWW for the answer to your questions *before*
asking a mailing list. That way people don't have to answer the same
question again and again. 

If you had done so, you would have discovered that you should set you
MPS setting in the BIOS to 1.1 and reboot. If you are still having
problems, make sure you have the lastest BIOS (rev 1014?) and/or use the
"noapic" option on the boot command line.

IO-APIC allows both processors to field interrupts. Without IO-APIC,
only one processor does. Usually, for a desktop machine, this is not a
calamity. For a web server, it's more of an issue.

If everything is working, your /proc/interrupts should look something
like:

           CPU0       CPU1       
  0:    1255948    1257289    IO-APIC-edge  timer
  1:      15469      15349    IO-APIC-edge  keyboard
  2:          0          0          XT-PIC  cascade
  4:      11163      10377    IO-APIC-edge  serial
  5:      79559      79534   IO-APIC-level  es1371, usb-uhci, usb-uhci
  8:    9869264    9862018    IO-APIC-edge  rtc
  9:      17601      17613   IO-APIC-level  sym53c8xx
 10:     109682     109643   IO-APIC-level  eth0
 11:         47         50   IO-APIC-level  sym53c8xx
 12:     136004     138160    IO-APIC-edge  PS/2 Mouse
 14:        224        134    IO-APIC-edge  ide0
 15:      29773      28616    IO-APIC-edge  ide1
NMI:          0          0 
LOC:    2513322    2513376 
ERR:          0
MIS:          0


--- Vladimir

--------
Vladimir G. Ivanovic                        http://leonora.org/~vladimir
2770 Cowper St.                                         vladimir@acm.org
Palo Alto, CA 94306-2447                                 +1 650 678 8014

"hm" == hamhey m <hamhey> writes:

  hm> Dear sir/madam
  hm> I installed Linux redhat 7.1 on Intel platform running 2x Intel-800 Mhz 
  hm> processor on ASUS CUV4x-D mother board. 
  hm> One of the CPUs is not cooming up due to the following error message at boot:

  hm> --------------------------------------------------------------------
  hm> Total of 2 processors activated (3207.98 Bogo MIPS). Before bogomips.
  hm> Boot done.
  hm> ENABLING IO-APIC IRQs
  hm> ... changing IO_APIC physical APIC ID to 2 .. ok.
  hm> Syc=nchronizing Arb IDs 
  hm> TIMER: vector=49 Pin1=2 testing the IO APIC pin2=0

  hm> WARNING: Unexpected IO-APIC IRQs

  hm> --------------------------------------------------------------------

  hm> Would you mind giving me the reason of getting the reason of the error message 
  hm> at boot time and the system is comming with just on CPU without any problem 
  hm> choosing  Linux-Up option for booting.


  hm> Thanks 
  hm> Hamdi

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