Kubuntu 10.10 and real-time kernel

[Victor henri]

> Date: Sun, 27 Feb 2011 11:47:24 +0100
> Subject: Re: Kubuntu 10.10 and real-time kernel
> From: abogani at ubuntu.com
> To: ubuntu-studio-users at lists.ubuntu.com
> 
> Hi,
> 
> 2011/2/26 Hartmut Noack <zettberlin at linuxuse.de>:
> [...]
> > Kernel and System-Setup are really important. If a capable basic-system is
> > set up carefully, the desktop-system does not matter much.
> [...]
> 
> I agree, definitely.
> 
> Please note that Ubuntu Studio don't offer that level of setup at the moment.

Hello,

Could you please be more specific on what is missing in Ubuntu Studio to get that level of setup?

This what I know already :

 - Ubuntu Studio already automatically configure the /etc/security/limits.d/audio.conf  by adding the lines :

         @audio   -  rtprio     95
         @audio   -  memlock    unlimited

You just have to add yourself in the 'audio' group manually. 

  - However, there seem to be a problem if you use a generic kernel in Ubuntu 10.10, because in Ubuntu 10.10 the "RT_GROUP-SCHED" option in the kernel is activated. As far as I understand, this means that doing the previous manipulation (ie configuring the /etc/security/limits.d/audio.conf and adding yourself in the audio group) won't allow real-time erformance for JAck...

"The RT_GROUP_SCHED option overrides everything that may have been configured in limits.conf and makes it very complex for regular users to get access to the realtime scheduling that JACK works best with. "

This comes from Jack-audio-connection-kit FAQ http://jackaudio.org/linux_group_sched

Ok so the only option is to use a precompiled real-time kernel, or a preemnt kernel having that RT_GROUP_SCHED option disabled (for example in Alessio Bogani's ppa), (or a "home-compiled" kernel, which is what i'm doing), or use other solutions like it is said in the jack FAQ page I mentioned .

- The rtirq-init script has to be used; 

Is there something else in Ubuntu Studio that has to be set up?

Thank you very much.

Victor


> 
> Ciao,
> Alessio
> 
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