[linux-audio-user] Re: Frustrated bigtime

[Noah Roberts]

> So, I'll try this upgrade, which includes a lot of setting changes to
> more appropriate values, and then I'll get back with success/failure
> rate.  Thanks for the ideas.
> 

Well, I upgrated to 13-rc6 and tried the patch.  The patch ruins the
kernel source...it won't compile on this architecture (amd64) with it
applied.  However, it seems to be included to some degree already. 
There are only 3 preempt modes and I chose the best...the one I wanted
to try first anyway.  I also fixed the IDE driver issues.

I haven't even messed with any of the interupts.  It is working...for
now at least.  I even started mozilla in the middle of a playback to
test and I didn't get an xrun.  I did get 2 while typing this and they
were not small ones.

I am also wondering if it might be some acpi setting I could change
that would help a lot.  For instance:

localhost CPU1 # cat power
active state:            C2
max_cstate:              C8
bus master activity:     000021eb
states:
    C1:                  type[C1] promotion[C2] demotion[--]
latency[000] usage[00000010]
   *C2:                  type[C2] promotion[C3] demotion[C1]
latency[090] usage[30301282]
    C3:                  type[C3] promotion[--] demotion[C2]
latency[900] usage[00014940]

Maybe switching to C1 could help?  I'm assuming latency should be smaller...

I also can't seem to find out which interrupt my soundcard is on.  I
don't see it in the list:

localhost proc # cat interrupts
           CPU0
  0:     318085    IO-APIC-edge  timer
  1:       3765    IO-APIC-edge  i8042
  8:          0    IO-APIC-edge  rtc
  9:       1694   IO-APIC-level  acpi
 12:       1170    IO-APIC-edge  i8042
 14:       6163    IO-APIC-edge  ide0
 15:         12    IO-APIC-edge  ide1
177:      29479   IO-APIC-level  SiS SI7012
185:        519   IO-APIC-level  eth0
193:      15025   IO-APIC-level  ohci_hcd:usb1
201:          0   IO-APIC-level  ohci_hcd:usb2
209:          0   IO-APIC-level  ohci_hcd:usb3
217:         54   IO-APIC-level  ehci_hcd:usb4
NMI:       1088
LOC:     318053
ERR:          0
MIS:          0

And what is the proc file interface for the preempt patch?