[LAD] Jackd & Real Time Kernel

[Joakim Hernberg]

Try renaming it to audio.conf and relogin.

On Sat, 13 Jan 2018 14:58:28 +0000
Benny Alexandar <ben.alex at outlook.com> wrote:

> Hi Len,
> 
> I'm using  jackdmp 1.9.12.  I checked the
> file /etc/security/limits.d/audio.conf, and is named as
> audio.conf.disabled. How to enable this ?
> 
> When I run my jack client standalone program, I could see the prints
> as follows,
> 
> ------------------
> jackdmp 1.9.12
> 
> JACK server starting in realtime mode with priority 10
> self-connect-mode is "Don't restrict self connect requests"
> Cannot lock down 82280346 byte memory area (Cannot allocate memory)
> creating alsa driver ...
> hw:0|hw:0|1024|2|48000|0|0|nomon|swmeter|-|32bit configuring for
> 48000Hz, period = 1024 frames (21.3 ms), buffer = 2 periods ALSA:
> final selected sample format for capture: 32bit integer little-endian
> ALSA: use 2 periods for capture ALSA: final selected sample format
> for playback: 32bit integer little-endian ALSA: use 2 periods for
> playback Cannot use real-time scheduling (RR/10)(1: Operation not
> permitted) AcquireSelfRealTime error
> Cannot lock down 82280346 byte memory area (Cannot allocate memory)
> JACK server started
> Cannot use real-time scheduling (RR/5)(1: Operation not permitted)
> JackClient::AcquireSelfRealTime error
> -----------------------------------
> 
> -ben
> 
> 
> 
> ________________________________
> From: Len Ovens <len at ovenwerks.net>
> Sent: Friday, January 12, 2018 10:27 PM
> To: Benny Alexandar
> Cc: linux-audio-dev at lists.linuxaudio.org
> Subject: Re: [LAD] Jackd & Real Time Kernel
> 
> On Fri, 12 Jan 2018, Benny Alexandar wrote:
> 
> > I just compiled simple_client.c and things starts to work.
> > My doubt is do I need to install linux real-time kerel update for
> > JACK.
> 
> It depends... personally, I use the lowlatency kernel with no problems
> using an ice1712 based PCI card audio interface. Your situation may
> differ.
> 
> > How do I know if jack is running real time, is it by checking for
> > xruns ?
> 
> Jack runs in real time mode by default. If you are running jackd2
> (version 1.9*) then check ~/.log/jack/jackdbus.log
> 
> for the line:
> Thu Dec 28 10:38:26 2017: JACK server starting in realtime mode with
> priority 10
> 
> Otherwise the same line will appear in jackd terminal output when
> started.
> 
> Do note that part of the jackd instalation process sometimes gets
> missed by some installers. There should be a file
> /etc/security/limits.d/audio.conf If this is missing or named as
> disabled, you may not be able to get jackd to start in realtime mode.
> The two lines of importance in that file are:
> @audio   -  rtprio     95
> @audio   -  memlock    unlimited
>   Depending on your distro the group may be other than audio.
> Whatever that group is, your user needs to be a part of it. Most
> audio distributions get this right already (even ubuntustudio), but
> non-audio distros generally need this to be fixed. After adding
> yourself to the audio (or whatever) group you will need to logout and
> back in before that will have any effect.
> 
> --
> Len Ovens
> www.ovenwerks.net<http://www.ovenwerks.net>
> 



-- 

   Joakim