Re: IRQ Question?
- From: "Wilkinson, Alex" <alex.wilkinson@xxxxxxxxxxxxxxxxxxx>
- Date: Thu, 19 Apr 2007 15:15:53 +0800
0n Wed, Apr 18, 2007 at 07:26:35PM -0700, Nate Lawson wrote:
>> FreeBSD 7.0-CURRENT #0: Tue Apr 10 13:47:53 WST 2007
>>
>> Could be an insanely dumb question, however, I have to ask.
>>
>> Why don't IRQs in the BIOS map to IRQs in the output of vmstat(8) ?
>>
>> e.g.
>>
>> I manually changed an IRQ assingment of an Intel NIC [em(4)] to be on IRQ 11 in
>> the BIOS and vmstat(8) reports its as irq16.
>>
>> #vmstat -i | egrep -i em
>> irq16: em0 uhci0 2990236 18
>>
>> Can someone (njl@ jhb@) please enlighten me ?
>
>Interrupt routing is determined by a number of factors. Without acpi,
>it's determined by the BIOS initial irq and then anything the $PIR table
>changes (usually matches the BIOS value). With acpi, it's the BIOS irq
>and MADT acpi table. And that assumes APIC, not PIC-based routing.
>
>You can override the values with these tunables from the acpi man page:
>
> hw.pci.link.%s.%d.irq
> Override the interrupt to use for this link and index. This
> capability should be used carefully, and only if a device is not
> working with acpi enabled. "%s" is the name of the link (e.g.,
> LNKA). "%d" is the resource index when the link supports multi-
> ple IRQs. Most PCI links only have one IRQ resource, so the
> below form should be used.
>
> hw.pci.link.%s.irq
> Override the interrupt to use. This capability should be used
> carefully, and only if a device is not working with acpi enabled.
> "%s" is the name of the link (e.g., LNKA).
>
>You'll have to look at your dmesg to determine the proper values here.
Cheers Nate !
-aW
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