What determines which interrupts are shared under Linux?

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Hello,

On Linux when interrupts are defined similar to below, what defines say
ide2, ide3 to be on the same interrupt?    The bios, linux, the driver using
the interrupt? And can that be controlled/overrode at the kernel/driver level?

I have identified that the disks that are shared on ide2, ide3 do funny
things when both are being heavily used (dma_expiry), this is an older driver versions but I have experienced it before with a lot newer driver, and a bios adjustment previously fixed a similar issue, so that may be what is needed in this case also,
I am not sure how they fixed it, but I suspect that the setup the interrupt
to not be shared. I have a large number of machines and under heavy loads all seem to duplicate the issue, and it always happens with the disks on ide2/ide3,
never on the disk connected to ide4.

           CPU0       CPU1       CPU2       CPU3
  0:   56616921    5359998    7002142     938817          XT-PIC  timer
  1:          8         88         96          0    IO-APIC-edge  i8042
  2:          0          0          0          0          XT-PIC  cascade
  4:       2091        100        208       2477    IO-APIC-edge  serial
  8:          0          0          0          0    IO-APIC-edge  rtc
  9:          0          0          0          0   IO-APIC-level  acpi
 20:          0          0          0          0   IO-APIC-level  ehci_hcd
21: 0 950 401419 414482 IO-APIC-level ide4, ohci_hcd 22: 1165 1704243 576247 6796 IO-APIC-level ide2, ide3
 47:      65971          0          0          0   IO-APIC-level  eth0
NMI:          1          1          1          1
LOC:   69904264   69877733   69879541   69901903
ERR:          0
MIS:        105


                                      Roger
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