[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.mardorf at alice-dsl.net>
>         ninu at ninu-HPg6:~$ service rtirq status
>         
>           PID CLS RTPRIO  NI PRI %CPU STAT COMMAND
>            66 FF      90   - 130  0.0 S    irq/8-rtc0
>            62 FF      80   - 120  0.3 S    irq/16-ehci_hcd
>            63 FF      79   - 119  0.8 S    irq/21-ehci_hcd
>            65 FF      75   - 115  0.0 S    irq/1-i8042
>            64 FF      74   - 114  0.0 S    irq/12-i8042
>            35 FF      50   -  90  0.0 S    irq/9-acpi
>           189 FF      50   -  90  0.0 S    irq/41-rtsx_pci
>           217 FF      50   -  90  0.3 S    irq/42-ahci
>           424 FF      50   -  90  0.0 S    irq/43-mei
>           620 FF      50   -  90  0.4 S    irq/16-ath9k
>           742 FF      50   -  90  0.0 S    irq/44-i915
>          1377 FF      50   -  90  0.0 S    irq/40-eth0
>             3 TS       -   0  19  0.2 S    ksoftirqd/0
>            14 TS       -   0  19  0.1 S    ksoftirqd/1
>            19 TS       -   0  19  0.0 S    ksoftirqd/2
>            24 TS       -   0  19  0.0 S    ksoftirqd/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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>