Subject: Re: [linux-audio-user] audiophile 2496 - spdif in
From: jordan muscott (morsecode_AT_blueyonder.co.uk)
Date: Thu Oct 09 2003 - 13:43:34 EEST
wes schreiner wrote:
> jordan muscott wrote:
>
>> Ok to be honest I'm not gonna switch distros...... but are you saying
>> that Redhat offers you extra software that allows you to change the
>> IRQs that your pci cards are on?
>
>
>
> There is no such software on any distro. Your motherboard's BIOS
> decides which PCI slots get which IRQs. In a few motherboards the BIOS
> lets one select which IRQs get assigned to certain slots, but most
> don't. So with most motherboards all one can do is move cards around
> to different slots and then see what IRQ gets assigned.
Ah.. thankyou, this is what I thought to be the case.
> If your sound card and your ethernet card are sharing an IRQ, that's
> because those PCI slots used both have the same IRQ assignment. If you
> swap just those two cards slot-for-slot they will end up with the same
> IRQ again. Try moving just one of the cards to another slot. If all of
> your slots are full then move multiple cards.
>
> On some motherboards with some processors you can turn on Local APIC
> support in your kernel config and get more IRQs to work with. Dual
> processor motherboards, even if they have only one CPU installed, can
> do this to get more IRQs. If you have dual CPUs you should already be
> running a SMP kernel and you probably don't have IRQ assignment
> problems. If you do, it's back to juggling cards.
>
> wes
Again, thanks for the clear info.
Jordan.
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