[LAU] xruns from GeForce 7300 GS video card

Wed Apr 25 14:11:48 EDT 2007

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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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