[linux-audio-user] Uhm, low latency?

Mark Knecht mknecht at controlnet.com
Tue Feb 4 18:07:01 EST 2003

   Hi. IRQ5 == NOT_GOOD. The two normal ways to change hardware interrupts

1) Change the slot the card is in until you find the slot that uses the IRQ
you want. I recommend you do not share IRQs between your sound card and any
other device in your system. Asus MBs give you a table that describes which
slots are using shared IRQs. Follow the documentation if you have some.

2) Look and see if your BIOS allows you to set the IRQ of a specific slot.
If it does (my Asus MBs do, which is another reason I like them) then
reserve IRQ10 (or even IRQ9) for the slot your audio card is in. This is
sometimes a bit difficult to find. It is under something like Advanced PCI
Configuration in my BIOS. I've seen some GigaByte MBs that say they have
this feature, but then don't do anything.

   Humm...is this actually an ISA card? I hope not...


> -----Original Message-----
> From: linux-audio-user-admin at music.columbia.edu
> [mailto:linux-audio-user-admin at music.columbia.edu]On Behalf Of felipe
> Sent: Tuesday, February 04, 2003 2:41 PM
> To: linux-audio-user at music.columbia.edu
> Subject: Re: [linux-audio-user] Uhm, low latency?
> On Tuesday 04 February 2003 01:58, Mark Knecht wrote:
> >    lspci -v and tell us what IRQ you have for audio. Best (in my
> > experience) is IRQ 9, followed by 10, or 11.
> Uhm, my sound card (an opl3sa2 PnP) is using IRQ 5. IRQ 9 is taken by
> usb-uhci (which I rarely use for my camera), 10 is not used, 11
> is for the
> video card. I never tried to change the default values, how could
> I do that?
> Right now I enable the sound card at boot with
> $: isapnp /etc/isapnp.conf
> and then loading the alsa module, I thought this meant I could
> simply change
> the values in /etc/isapnp.conf but no...
> Anyways, working as root does the job very well, apart from freezing
> everything sometimes :)
> felipe
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