alex.wilkinson at dsto.defence.gov.au
Thu Apr 19 07:31:42 UTC 2007
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) ?
>> 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:
> 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.
> 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 !
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