Steven Critchfield wrote:
Funny since there is only 4 real IRQ lines on a PCI bus. They are A, B,
C, and D. If you have more than 4 slots on a PCI bus, then you are most
definately reusing a real IRQ wire.
That is a drastic oversimplification; each PCI slot has only four IRQ lines, but there is nothing that says that the lines have to be connected together between the slots. The first PCI boards were that way, but the spec does not mandate that they be interconnected.
On many current motherboards (especially server boards), they are not. All the IRQ lines from each slot go _separately_ to an APIC on the motherboard, where they are then routed as needed. For "simple" operating systems (those that don't support APIC routing), you end up with multiple devices sharing IRQs. Linux has the smarts to use the APIC to its full potential, so you can have all the devices (including the onboard NIC, sound, RAID, etc.) on separate IRQs. I have lots of systems working this way, and it's very nice.
Try compiling your kernel with APIC and IO-APIC support (including "local APIC support for uniprocessors") and see how it improves the IRQ routing in your system.
_______________________________________________
Asterisk-Users mailing list
[EMAIL PROTECTED]
http://lists.digium.com/mailman/listinfo/asterisk-users
To UNSUBSCRIBE or update options visit:
http://lists.digium.com/mailman/listinfo/asterisk-users
