My box works now as before.
pc:~ # cat /proc/interrupts
           CPU0       CPU1
  0:       5894       5418    IO-APIC-edge  timer
  1:         57         40    IO-APIC-edge  keyboard
  2:          0          0          XT-PIC  cascade
  8:          0          2    IO-APIC-edge  rtc
  9:          0          0    IO-APIC-edge  acpi
 12:        283        223    IO-APIC-edge  PS/2 Mouse
 14:          4          3    IO-APIC-edge  ide0
 16:       4044       3976   IO-APIC-level  aic7xxx
 18:         50         42   IO-APIC-level  eth0
NMI:      11227      11227
LOC:      11204      11203
ERR:          0
MIS:          0
Patch attached at the bottom of the page. If any comments, please cc me.
 
On Sunday 19 January 2003 19:54, you wrote:
> > Did the APIC or mpparse changes cause this?
>
> +#ifdef CONFIG_X86_CLUSTERED_APIC
> +static inline int target_cpus(void)
> +{
> +       static int cpu;
> +       switch(clustered_apic_mode){
> +               case CLUSTERED_APIC_NUMAQ:
> +                       /* Broadcast intrs to local quad only. */
> +                       return APIC_BROADCAST_ID_APIC;
> +               case CLUSTERED_APIC_XAPIC:
> +                       /*round robin the interrupts*/
> +                       cpu = (cpu+1)%smp_num_cpus;
> +                       return cpu_to_physical_apicid(cpu);
> +               default:
> +       }
> +       return cpu_online_map;
> +}
> +#else
> +#define target_cpus() (0x01)
> +#endif
> (2.4.21-pre3)
> that's wrong.....  0x01 -> 0xFF and it should be fixed
--- linux/include/asm-i386/smpboot.h    2003-01-20 16:45:13.000000000 +0100
+++ linux/include/asm-i386/smpboot.h.orig       2003-01-20 16:44:05.000000000 +0100
@@ -116,6 +116,6 @@
        return cpu_online_map;
 }
 #else
-#define target_cpus() (0xFFFFFFFF)
+#define target_cpus() (0x01)
 #endif
 #endif
-
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