[LAU] xruns in lowlatency kernel

[Pau Arumi]

Hi Eduard,
The same problem here: the only difference is that i have a macbook 
(core duo intel) not pro.
I'm also using the generic (non RT) Ubuntu Feisty (2.6.20) kernel and 
getting user RT privileges via limits.conf.

I believe the problem is related to the macbook internal audio device 
because when using my focusrite saffire audio interface, though 
jack-freebob driver i get almost no xrun!
My problem now is that yesterday my saffire broke without apparent 
reason (thankfully one output channel still working), but this is 
another story...

Regards,
Pau

eduard aylon wrote:
> Hi,
>
> I am having lots (thousands) of xruns in qjackctl and need some help 
> to address this issue. Any tips on what should I enable/disable, etc. 
> are appreciated.
> This happens under kernel 2.6.20 either generic or lowlatency. I 
> believe realtime patches are already applied in the lowlatency 
> version, isn't it? After googling a bit I found the appropriate way to 
> have realtime is to add the lines,
>
> @audio - rtprio 99
> @audio - nice -10
> @audio - memlock 500000
>
> to the /etc/security/limits.conf. But this hasn't help at all.
>
> I am running Ubuntu Feisty Fawn on a Macbook pro. More info follows 
> below.
>
> Thanks in advance,
>
> eduard
>
> ********
> .jackdrc
> ********
> /usr/bin/jackd -R -dalsa -dhw:0 -r44100 -p1024 -n2 -i2 -o2 -zs
>
> ***************************************************
> dmesg | grep "Linux version" outputs the following:
> ***************************************************
> [    0.000000] Linux version 2.6.20-14-lowlatency (root at rothera) (gcc 
> version 4.1.2 (Ubuntu 4.1.2-0ubuntu4)) #2 SMP PREEMPT Mon Apr 2 
> 20:41:03 UTC 2007 (Ubuntu Unofficial)
>
> *************
> groups output
> *************
>
> eaylon adm disk dialout cdrom floppy audio dip video plugdev netdev 
> lpadmin powerdev scanner admin
>
> *****************************
> cat /etc/security/limits.conf
> *****************************
>
> # /etc/security/limits.conf
> #
> #Each line describes a limit for a user in the form:
> #
> #<domain>        <type>  <item>  <value>
> #
> #Where:
> #<domain> can be:
> #        - an user name
> #        - a group name, with @group syntax
> #        - the wildcard *, for default entry
> #        - the wildcard %, can be also used with %group syntax,
> #                 for maxlogin limit
> #
> #<type> can have the two values:
> #        - "soft" for enforcing the soft limits
> #        - "hard" for enforcing hard limits
> #
> #<item> can be one of the following:
> #        - core - limits the core file size (KB)
> #        - data - max data size (KB)
> #        - fsize - maximum filesize (KB)
> #        - memlock - max locked-in-memory address space (KB)
> #        - nofile - max number of open files
> #        - rss - max resident set size (KB)
> #        - stack - max stack size (KB)
> #        - cpu - max CPU time (MIN)
> #        - nproc - max number of processes
> #        - as - address space limit
> #        - maxlogins - max number of logins for this user
> #        - maxsyslogins - max number of logins on the system
> #        - priority - the priority to run user process with
> #        - locks - max number of file locks the user can hold
> #        - sigpending - max number of pending signals
> #        - msgqueue - max memory used by POSIX message queues (bytes)
> #        - nice - max nice priority allowed to raise to
> #        - rtprio - max realtime priority
> #
> #<domain>      <type>  <item>         <value>
> #
> #*               soft    core            0
> #*               hard    rss             10000
> #@student        hard    nproc           20
> #@faculty        soft    nproc           20
> #@faculty        hard    nproc           50
> #ftp             hard    nproc           0
> #@student        -       maxlogins       4
>
> @audio - rtprio 99
> @audio - nice -10
> #@audio - memlock 4000000
> @audio - memlock 500000
> # End of file
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