Andrew Kohlsmith wrote:
On Tuesday 08 November 2005 18:20, George Pajari wrote:
To make a long story short, according to Intel Dealer Technical Support
(we became Intel dealers in order to get answers to our questions) there
is no Intel motherboard that permits the IRQs to be configured uniquely.
They are all hardwired and shared. This information applies to both the
Intel Desktop Board and Server Board product lines.
I find this almost impossible to believe.
In XT-PIC mode, absolutely. However every modern chipset utilizes an IOAPIC
now and every device has its own IRQ line. When the IOAPIC is in emulation
(XT-PIC) mode, then yes many of the interrupts get "merged" into the standard
16 interrupts.
However, if your Linux kernel is utilizing the IOAPIC's native mode things
change drastically:
# cat /proc/interrupts
CPU0
0: 942314955 IO-APIC-edge timer
1: 10 IO-APIC-edge i8042
8: 1 IO-APIC-edge rtc
9: 0 IO-APIC-level acpi
12: 111 IO-APIC-edge i8042
14: 496236 IO-APIC-edge ide0
177: 211098355 IO-APIC-level eth0
185: 2 IO-APIC-level ehci_hcd:usb1
193: 0 IO-APIC-level ohci_hcd:usb2
201: 0 IO-APIC-level ohci_hcd:usb3
209: 86 IO-APIC-level ohci_hcd:usb4
217: 3769265646 IO-APIC-level wct4xxp
As you can see on this particular system (not an Intel reference board,
granted, but my Intel boards do work similarly) everything is on its own
interrupt, and the interrupt numbers don't stop at 15.
I'd really like some clarification on that... Do Intel reference boards
actually tie the physical INT# signals of peripherals together, or are they
just stating that unless you use the native IO-APIC mode you will have shared
interrupts due to the "emulation"?
Here's a list form an Intel Server Board, Dual CPU support (only 1 CPU
installed):
CPU0
0: 120413974 IO-APIC-edge timer
1: 2434 IO-APIC-edge keyboard
2: 0 XT-PIC cascade
8: 1 IO-APIC-edge rtc
14: 642794 IO-APIC-edge ide0
15: 51 IO-APIC-edge ide1
18: 1204255212 IO-APIC-level wctdm
19: 1198491079 IO-APIC-level t1xxp
21: 3395482 IO-APIC-level eth0
22: 1198502476 IO-APIC-level wcte11xp
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