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Knowledge Base / Hardware / Why is my card getting an IRQ miss?

Why is my card getting an IRQ miss?
Views: 11203, Votes: 4

Posted:
15 Mar, 2006 -

Updated:
14 Mar, 2008 - Support D.
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Each peice of hardware takes 1,000 interrupts per second. When, for some reason the cards get less than this, an IRQ miss occurs. You can see if the card is missing interrupts using 'zttool.'

IRQ misses can cause different problems with Asterisk. Symptoms of IRQ misses are bad audio quality or perhaps PRI errors, although IRQ misses will not cause alarms. Also DTMF detection not working is something that can be caused by IRQ misses as well.

Several common things that contribute to IRQ misses are:
    -Running the X window system
    -Shared IRQs
    -No hard drive DMA
    -Hard drive DMA too high (shoot for udma3)
    -Running serial terminals or frame buffers

To check for shared IRQs you can run:

    # cat /proc/interrupts

  CPU0  
0 10756672 XT-PIC timer
2 0 XT-PIC cascade
5 10812879 XT-PIC uhci_hcd, uhci_hcd, wctdm
10 226219 XT-PIC t1xxp, CS46XX
11 1550046 XT-PIC eth0, nvidia
12 387234 XT-PIC i8042
14 32641 XT-PIC ide0
15 18
 XT-PIC ide1
NMI 0  
LOC 10757616  
ERR 40481  
MIS 0  


Notice the T100P card sharing with the sound card, and the TDM400P card is sharing with the USB controller. This will most likely cause problems. If you are not using any USB devices that would probably be ok, but it would be best to disable USB or get the card on it's own IRQ.

There are several ways to move cards to their own IRQ.
    -Turn on APIC
    -Tweak BIOS settings
    -Try a different PCI slot
    -Use setpci
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