14 Nov
2006
14 Nov
'06
6:56 p.m.
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Julian Hagenauer wrote:
Hi,
i am using Debian testing with libpam-modules 0.79-4.
I added
@audio - rtprio 99
@audio - nice -10
@audio - memlock 250000
to /etc/security/limits.conf and i am member of the audio-group.
If i start jack with 'jackd -R -d alsa' it says:
jackd 0.101.1
Copyright 2001-2005 Paul Davis and others.
jackd comes with ABSOLUTELY NO WARRANTY
This is free software, and you are welcome to redistribute it
under certain conditions; see the file COPYING for details
JACK compiled with System V SHM support.
loading driver ..
creating alsa driver ... hw:0|hw:0|1024|2|48000|0|0|nomon|swmeter|-|32bit
control device hw:0
configuring for 48000Hz, period = 1024 frames, buffer = 2 periods
nperiods = 2 for capture
nperiods = 2 for playback
As you see there no warning about missing realtime-cappabilities, anyhow realtime seems
not work, because i got a lot of xruns....
What i am missing?
I run Debian Sid and realtime works perfectly.
$ apt-cache policy libpam-modules
libpam-modules:
Installed: 0.79-4
Candidate: 0.79-4
Version table:
*** 0.79-4 0
500 http://ftp.us.debian.org testing/main Packages
500 http://ftp.us.debian.org unstable/main Packages
The /etc/security/limits.conf as shipped by Debian does still need to be
edited (as you have already done).
Do i need other requirements to fullfill to get
realtime to work, e.g. special kernel-configuration?
Yes - a kernel configured for realtime preemtion.
$ zcat /proc/config.gz |grep PREEMPT_RT
CONFIG_PREEMPT_RT=y
The realtime patcheset is slowly getting incorporated into the main
kernel tree. Not exactly sure what the status of that is at this time.
If you don't want to build your own rt kernel you can get one here:
http://mzilikazix.org
These are even configured for 1000 Hz kernel timer.
$ zcat /proc/config.gz |grep CONFIG_HZ_1000=y
CONFIG_HZ_1000=y
Several flavors to choose from with more on the way.
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