Re: [LAU] xruns from GeForce 7300 GS video card

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David Froseth schrieb:
> I went into the BIOS of my Gigabyte GA-965P-DS3 mobo and I changed the
> PCI1 IRQ Assignment from "Auto" to "9". When I checked /proc/interrupts
> , the ICE1712 us still at 74.
> any ideas? Also the video card fits in
> the PCI Express x16 slot. There is no IRQ Assignment option for this
> slot in the BIOS. The command 'lspci -vvv' lists the nvidia card:
>
> 01:00.0 VGA compatible controtter: nVidia ...
> Interrupt: pin A routed to IRQ 15
>
> The IRQ number 15 does not show in the /proc/interrupts file. Why? I do
> not recognize any of the items in the /proc/interrupts list as being the
> video card. 'lspci -vvv' also shows:
>
> 05:00.0 Multimedia audio controller: VIA .... ICE1712 ...
> Interrupt: pin A routed to IRQ 74
>
> It seems the BIOS change did not work on the sound card.
>

The interrupts are abstracted by acpi, to have the BIOS-Settings you
made reflected in /proc/interrupts you need to start your system with
acpi=no - this must be put in /boot/grub/menu.lst somewhat like this:

kernel /boot/vmlinuz-2.6.15-26-386 root=/dev/hda6 ro acpi=no splash

BUT: if the system behaves as you wish now, there is no need to abandon
acpi. To find out, If the IRQ-thing is basically set OK is simple
enough: In the most cases the M-Audio does not work if it has to share
its IRQ - so if it works OK playing an ogg-file with xmmms via alsa the
card should be set up OK.

> How can I find out if I have installed the low-latency kernel?

try :

:~$ uname -a

good luck ;-)
HZN

>
> Thanks,
> Dave
>
>
>
> Hartmut Noack wrote:
>
> David Froseth schrieb:
>
>>>> Geoff,
>>>>
>>>>
>>>> By changing the the Periods/Buffer to 3, and the Frames/Period to
>>>> 512, I have a latency of 32 msec, and I am getting very few xruns. I am
>>>> now recording digital tracks for the first time! Thank you! I hope to
>>>> improve this latency after getting Ubuntu Studio all set up and working.
>
>
> You can simply install kernel-lowlatency from universe. With this one I
> run 2 Systems (one with GF7500-Graphics, both with ICE1712-M-Audiocards)
> with quite good Results:
>
> 128/2 - 5.8ms est. latency
> about 5 xrus in an 8h-Session with Ardour plus few plugins
> about 5 xruns/h with ZynaddsubFX, jamin, jackrack with 5 plugins, seq24,
> rosegarde, Ardour2 all at the same time...
>
> If used with some caution the systems can run with less then 2ms est.
> latency
>
>
>
>>>> My /proc/interrupts folder now shows the Delta 1010 card:
>>>>
>>>> $ cat /proc/interrupts
>>>> CPU0 CPU1
>>>> 0: 1945465 0 IO-APIC-edge timer
>>>> 1: 7 0 IO-APIC-edge i8042
>>>> 7: 0 0 IO-APIC-edge parport0
>>>> 8: 3 0 IO-APIC-edge rtc
>>>> 9: 1 0 IO-APIC-level acpi
>>>> 50: 2 0 IO-APIC-level uhci_hcd:usb4, ehci_hcd:usb7
>>>> 58: 9892 0 PCI-MSI sky2
>>>> 66: 26115 0 IO-APIC-level HDA Intel
>>>> 74: 1573081 0 IO-APIC-level ICE1712
>>>> 169: 69166 0 IO-APIC-level ide0, uhci_hcd:usb2
>>>> 177: 105201 0 IO-APIC-level libata, libata, libata,
>>>> ohci1394, uhci_hcd:usb5
>>>> 225: 0 0 IO-APIC-level ehci_hcd:usb1, uhci_hcd:usb6
>>>> 233: 0 0 IO-APIC-level uhci_hcd:usb3
>>>> NMI: 0 0
>>>> LOC: 1945329 1945329
>>>> ERR: 0
>>>> MIS: 0
>>>>
>>>>
>>>>
>>>> I assume the ICE1712 is the Delta 1010's chip.
>
>
> correct!
>
>
>>>> Is there a way to remap
>
>
> You should map the slot of the M-Audio to a specific IRQ (pref. 9, 10,
> or 11...) look here for details:
>
> http://lowlatency.linuxaudio.org/
>
> This must be done in the BIOS.
> If this not helps I would consider to disable the Parallell Port (unless
> you use a device antique enough to have a parport-connecion only ;-) )
> and then the HDA-Intel.
>
> Rule of thumb: dead men tell no tales - disabeling everything, that is
> not really needed is allways a good idea...;-)
>
>
>>>> or change its interrupt priority?
>
>
> there is a tool from Rui Nuno Capela to do that it did not help much on
> my machines but is worth the try anyway... It is available for OpenSuse
> via Jacklab (on wich I used it...), yet I dont know for now, where to
> get it for Debianoids...
>
> good luck ;-)
>
> HZN
>
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Received on Thu Apr 26 00:15:01 2007