Re: [ubuntu-studio-users] Real Time kernel US 13.04

[Nicola]

Hi all,

Just an update.
I compiled my own rt kernel following the system configuration guide
http://wiki.linuxaudio.org/wiki/system_configuration#the_kernel
I've used the linux-3.2.35 kernel with the 3.2.35-rt52 patch compiled
against the .config of the latest low-latency kernel available from
13.04 repo.
All seems working SO FAR better now on my machine.
I have no problem running jack at 44100/128/2 (5.8 ms latency) just a
couple of xrun in 30 mins of session.
Disabling pulseaudio i can improve the situation even more...

For the moment i'm really satisfied.
I've got the deb files if someone needs it.
Nicola


On Tue, 2013-07-30 at 00:35 +0100, nicola.di.marzo @vodafone.it wrote:
 Thanks Ralf for the suggestions.
 
 
 Tomorrow i will experiment a little bit.
 
 One strange thing that i don't understand is why does still compare
 the webcam (on the bus 2) in lsusb even if i blacklisted the uvcvideo
 e videodev drivers?
 
 
 I also found a very interesting discussion about rtirq made on LAU
 http://linux-audio.4202.n7.nabble.com/Re-Issue-with-the-priority-of-the-sound-cards-using-rtirq-td40952i20.html
 
 
 Cheers
 
 Nicola
 
 
 
 2013/7/29 Ralf Mardorf ralf.mard...@alice-dsl.net
 ninu@ninu-HPg6:~$ service rtirq status
 
   PID CLS RTPRIO  NI PRI %CPU STAT COMMAND
66 FF  90   - 130  0.0 Sirq/8-rtc0
62 FF  80   - 120  0.3 Sirq/16-ehci_hcd
63 FF  79   - 119  0.8 Sirq/21-ehci_hcd
65 FF  75   - 115  0.0 Sirq/1-i8042
64 FF  74   - 114  0.0 Sirq/12-i8042
35 FF  50   -  90  0.0 Sirq/9-acpi
   189 FF  50   -  90  0.0 Sirq/41-rtsx_pci
   217 FF  50   -  90  0.3 Sirq/42-ahci
   424 FF  50   -  90  0.0 Sirq/43-mei
   620 FF  50   -  90  0.4 Sirq/16-ath9k
   742 FF  50   -  90  0.0 Sirq/44-i915
  1377 FF  50   -  90  0.0 Sirq/40-eth0
 3 TS   -   0  19  0.2 Sksoftirqd/0
14 TS   -   0  19  0.1 Sksoftirqd/1
19 TS   -   0  19  0.0 Sksoftirqd/2
24 TS   -   0  19  0.0 Sksoftirqd/3
 
 Unbind ehci_hcd with irq 16 and use ehci_hcd with irq 21 for
 the USB
 sound device. Disabling WLAN might be useful too, even when it
 doesn't
 share the irq.
 
 
 http://wiki.linuxaudio.org/wiki/system_configuration#solve_irq_conflict_by_unbinding_devices
 
 Or at least take care that the used USB slot is head of the
 USB slots,
 
 RTIRQ_NAME_LIST=rtc snd usb i8042
 
 instead of usb add the number usb1 or similar, ask Rui, if
 it
 shouldn't be described by
 
 http://wiki.linuxaudio.org/wiki/system_configuration#rtirq
 
 Rui Nuno Capela
 rncbc at rncbc dot org
 
 
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Real Time kernel US 13.04

[Nicola]

Hi all,

Is it available a Real Time kernel for the 13.04?
I've tried both the default lowlatency kernels but to be honest i'm not
satisfied with them.
With my hp pavilion g6 can't get good results with jack below 11,6 ms
(many xruns) even if i tried several further configurations (ex, i
disabled pulseaudio).
Even though i use a Roland ua25-ex that stands undisturbed upon its
interrupt line...
Any tips eventually?

Thanks
Cheers
Nicola

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