linux-os (Dick Johnson) wrote:
On Thu, 15 Feb 2007, Mike Panetta wrote:
> I am not on the list (corperate email sucks) so please CC any replies to
> me. Thanks.
[snip]
> I have seen the preempt patches, but they touch a lot of files, and we
> have gone through testing with the 2.6.16.19 kernel and do not wish to
> change, and we cannot find a version of the patch for this kernel. Is
> there something smaller/simpler I can do? My understanding is the
> priority in the APIC is set in software via the interrupt vector number
> (higher numbers have lower priority) is this true? If so, how hard
> would it be for me to just change the vector numbers around?
>
[snip]
> Thanks,
> Mike
Can't you muck with the BIOS settings? That's where the primary
hardware gets 'connected'.
I did try that. The BIOS only allows me to either allocate an IRQ to be
a PCI interrupt, or reserve it (for what I have no idea). The IRQ's
listed in the BIOS are also different from the ones Linux sees. I think
the BIOS is seeing the XT-PIC IRQ numbers and Linux is seeing the APIC
numbers. For example the little bios blurb that prints before the
system boots says the USB controller I am interested in is
assigned/using IRQ 10, Linux sees it using IRQ 18.
I have found that I can keep Linux from using the APIC by disabling it
with a kernel command line switch, but that does not help, it just makes
Linux use the XT-PIC instead of the IO-APIC to do IRQ routing.
So I guess I'm back to my original question of 'Would changing the
vector numbers do what I want?' and if the answer is 'yes', how would I
do it?
Thanks,
Mike
Cheers,
Dick Johnson
Penguin : Linux version 2.6.16.24 on an i686 machine (5592.61 BogoMips).
New book: http://www.AbominableFirebug.com/
_
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