[LAU] xruns in lowlatency kernel

[eduard aylon]

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