Eric,
I understand what you are saying about APIC... and from my understanding the
O/S takes over control of the IRQs.. but aren't there still only 15 physical
IRQs that you can set in the BIOS for devices? I've never seen a machine
in which I could go above 15 for a device in the BIOS.
I have a machine on which I have APIC turned on and cat/proc/interrupts
shows:
CPU0
0: 103074143 IO-APIC-edge timer
1: 79 IO-APIC-edge i8042
2: 0 XT-PIC cascade
8: 1 IO-APIC-edge rtc
12: 93 IO-APIC-edge i8042
14: 23 IO-APIC-edge ide0
121: 663241 IO-APIC-level uhci_hcd:usb2, eth0
137: 0 IO-APIC-level uhci_hcd:usb3
153: 0 IO-APIC-level ehci_hcd:usb1
161: 104218 IO-APIC-level ips
169: 103024435 IO-APIC-level wctdm24xxp
NMI: 0
LOC: 103059761
ERR: 0
MIS: 0
Everything looks good, yes? wctdm24xxp is on it's own IRQ. However, that's
not entirely true. If you do an lspci -vb you get:
[EMAIL PROTECTED] ~]# lspci -bv | grep -i "IRQ 11" --before-context=2
00:1d.0 USB Controller: Intel Corporation 82801EB/ER (ICH5/ICH5R) USB UHCI
Controller #1 (rev 02) (prog-if 00 [UHCI])
Subsystem: IBM: Unknown device 02dd
Flags: bus master, medium devsel, latency 0, IRQ 11
--
04:04.0 Ethernet controller: Unknown device d161:2400 (rev 11)
Subsystem: Unknown device d161:2400
Flags: bus master, medium devsel, latency 64, IRQ 11
--
05:00.0 Ethernet controller: Broadcom Corporation NetXtreme BCM5721 Gigabit
Ethernet PCI Express (rev 11)
Subsystem: IBM: Unknown device 02c6
Flags: bus master, fast devsel, latency 0, IRQ 11
Ooops. There's the Ethernet controller and the Digium (Unknown device) on
the same IRQ.
On 2/11/07, Eric ManxPower Wieling <[EMAIL PROTECTED]> wrote:
None of these mention APIC, so I assume they are written about machines
without APIC support. I'm sure what you claim was true in 1998, but is
not true on any modern PC.
Here are some links about APIC and IO-APIC.
http://www.microsoft.com/whdc/system/sysperf/apic.mspx
http://osdev.berlios.de/pic.html
http://www.tek-tips.com/faqs.cfm?fid=4455
http://www.asteriskguru.com/tutorials/pci_irq_apic_tdm_ticks_te410p_te405p_noise.html
MANY other types of cards have issue with sharing IRQs. This seems to
be especially common with audio cards.
Matt wrote:
> Sure, not a problem.
>
> http://www.pcguide.com/ref/mbsys/res/irq/num.htm
> *IRQ Number:* The number of the IRQ from 0 to 15.
>
> http://www.pcnineoneone.com/howto/irq1.html
>
> http://www.computerhope.com/irqs.htm
> No, unfortunately with PCs they are limited to 00-15.
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