24 Apr
2007
24 Apr
'07
10:12 a.m.
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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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