25 Apr
2007
25 Apr
'07
4:11 p.m.
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David Froseth schrieb:
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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:
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>> 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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