25 Apr
2007
25 Apr
'07
2:21 a.m.
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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