Re: [LAU] midi keyboards, jackd, low latency

On Thu, Feb 26, 2009 at 7:55 PM, Bradley Reed <bradreed1@email-addr-hidden> wrote:
> On Thu, 26 Feb 2009 19:20:48 -0200
> tizo <tizone@email-addr-hidden> wrote:
>
>
>> Looking at the different IRQ, I have saw that my sound card is sharing
>> the IRQ 16 with an USB port, and the video driver. This is a cat of
>> /proc/interrupts:
>>
>> I have searched a lot on Internet, and even in the list, and I have
>> not found a way to change the IRQ assignments. In fact, I have read
>> some mails that said that I can't do that in a laptop (except in some
>> Thinkpads, where IRQ can be changed in the BIOS), as in PCs this can
>> be done changing the card to other slot. In other places, some kernel
>> parameters were suggested to obtain other IRQ assignments, but the
>> only parameter that change those in my computer, was "acpi=off", and
>> it was not better. In this case, /proc/interrupts shows the following:
>>
> When you load the snd-hda-intel module include the enable_msi=1 option.
> I do this on my laptop by adding the line:
>
> options snd-hda-intel enable_msi=1
>
> to my /etc/modprobe.d/sound file (but the file may be different on
> your distro. I use Slackware.)
>
> This moves my sound card to an interrupt of its own on my laptop.
>
> HTH,
> Brad
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>

That work perfectly. In my ubuntustudio the file to edit was
/etc/modprobe.d/alsa-base. My sound card now has its own IRQ (508).

I raise the priority of that IRQ, but sadly, the latency of jack did
not improve.

Thanks very much,

tizo
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Received on Fri Feb 27 20:15:04 2009