2.6.23.9 64-bit IRQ sharing without irqbalance with p35 vs i965?

Can some please explain with almost identical kernel .config's I see this on a p965 Intel board:

           CPU0       CPU1       CPU2       CPU3
  0: 2501669875          0          0          0   IO-APIC-edge      timer
  1:          8          0          0          0   IO-APIC-edge      i8042
  7:          0          0          0          0   IO-APIC-edge      parport0
  8:          1          0          0          0   IO-APIC-edge      rtc
  9:          0          0          0          0   IO-APIC-fasteoi   acpi
 12:   21187797          0          0          0   IO-APIC-edge      i8042
 16:   29096123          0          0          0   IO-APIC-fasteoi   sata_sil24, uhci_hcd:usb3
 17:        122          0          0          0   IO-APIC-fasteoi   libata
 18:   27177188          0          0          0   IO-APIC-fasteoi   sata_sil24, ehci_hcd:usb1, uhci_hcd:usb7
 19:   29230654          0          0          0   IO-APIC-fasteoi   sata_sil24, ohci1394, uhci_hcd:usb6
 21:   41626956          0          0          0   IO-APIC-fasteoi   uhci_hcd:usb4, eth1
 22:        203          0          0          0   IO-APIC-fasteoi   HDA Intel
 23:        108          0          0          0   IO-APIC-fasteoi   ehci_hcd:usb2, uhci_hcd:usb5
377:  590862399          0          0          0   PCI-MSI-edge      eth0
378:   89967666          0          0          0   PCI-MSI-edge      ahci

NMI: 0 0 0 0 LOC: 2501568889 2501566748 2501569508 2501566435 ERR: 0

And this on a Gigabyte p35 chipset:

           CPU0       CPU1       CPU2       CPU3
  0:    4798363    4806242    4807103    4801203   IO-APIC-edge      timer
  1:          1          2          3          2   IO-APIC-edge      i8042
  6:          3          0          0          0   IO-APIC-edge      floppy
  8:          0          0          0          1   IO-APIC-edge      rtc
  9:          0          0          0          0   IO-APIC-fasteoi   acpi
 12:         22         32         26         33   IO-APIC-edge      i8042
 16:          0          0          0          0   IO-APIC-fasteoi   ahci, uhci_hcd:usb3
 17:      16994      17065      16955      16952   IO-APIC-fasteoi   libata, eth0
 18:          0          1          1          1   IO-APIC-fasteoi   ohci1394, ehci_hcd:usb1, uhci_hcd:usb5, uhci_hcd:usb8
 19:          0          0          0          0   IO-APIC-fasteoi   uhci_hcd:usb7
 21:          0          0          0          0   IO-APIC-fasteoi   uhci_hcd:usb4
 22:         38         39         40         38   IO-APIC-fasteoi   HDA Intel
 23:          0          0          0          0   IO-APIC-fasteoi   ehci_hcd:usb2, uhci_hcd:usb6
380:    6838702    6823411    6822704    6836873   PCI-MSI-edge      ahci

NMI: 0 0 0 0 LOC: 18993695 18993662 18891135 18891030 ERR: 0

Both are running Debian Lenny (testing) with (almost the same exact kernel configuration).

Why is this?

Justin.
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