[LAU] xruns from GeForce 7300 GS video card

[David Froseth]

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.


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


Thanks,
Dave



Hartmut Noack wrote:

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> 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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