[Asterisk-Users] Intel Desktop MotherBoards Unsuitable for Digium Boards

[Kevin Hanson]

Rusty Dekema wrote:

> How do you get your system to use IO-APIC style interrupts? I am 
> running linux-2.6.14 and have enabled "Local APIC support on 
> uniprocessors" and "IO-APIC support on uniprocessors" in the kernel 
> options, but /proc/interrupts says that everything is using XT-PIC. I 
> am running an Intel P3-1200 CPU although I forget what chipset the 
> machine has. Is there an option in the BIOS of a typical Intel machine 
> that needs to be enabled in order for this to work?
>
> This has not been a problem in the past as I have been using only SIP 
> and IAX connections. But I have ordered a digium TDM card and will be 
> installing it tomorrow, and I would like to head off any potential 
> problems if possible.
>
> -Rusty
>
>
Run "dmesg".  Do you see something like:

Local APIC disabled by BIOS -- you can enable it with "lapic"

If so, there may be something in your bios.  Or try appending 'lapic' to 
your kernel boot parameters in grub / lilo.  'lapi' will try to override 
the bios setting and use io-apic.

My results have been mixed.  On older machines using 'lapic' as a kernel 
boot parameter produces a message in dmesg that indicates it is 
overriding bios, but I still only get XT-APIC.

Cheers,
Kevin
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