Automatic realtime IRQ priorities using rtirq
Saturday, 3. January 2009, 15:31:17
UPDATE: I've JUST noticed that there's an RPM at http://www.rncbc.org/jack/ - install and you're away! That man's a genius.
When using audio on Linux, you have to be aware of the the realtime priorities of the system. And even though you may have edited the /etc/security/limits.conf file, the thread priorities of the sound card will not be set.
Rui Nuno Capela [creator of qjackctl and the excellent qtractor] wrote a script to help set the priorities of the most likely IRQs for your system. It didn't require any tweaking; however, when I first tried to use it there were no instructions as to how to apply it. SO...
Now when you enter rcrtirq you'll get
You can only use the command as root unfortunately, but it doesn't matter because this script will now start when you switch your computer on - which means you don't have to think about it!
When using audio on Linux, you have to be aware of the the realtime priorities of the system. And even though you may have edited the /etc/security/limits.conf file, the thread priorities of the sound card will not be set.
Rui Nuno Capela [creator of qjackctl and the excellent qtractor] wrote a script to help set the priorities of the most likely IRQs for your system. It didn't require any tweaking; however, when I first tried to use it there were no instructions as to how to apply it. SO...
- Download the script from http://www.rncbc.org/jack/ (you'll need to head to the end of the page)
- Extract the tar file. For this I used my file browser, PCManFM. No need for the terminal. Yet.
- NOW open a terminal.
- Become root by typing su and the root password.
- Enter cd {path to rtirq script} - this takes you to where the script is.
- Then cp rtirq.conf /etc/ - this copies rtirq's config file to /etc/
- Then cp rtirq.sh /etc/init.d/rtirq - this copies rtirq.sh to the /etc/init.d/ folder, making it a system script. It then renames it as rtirq
- Now enter insserv /etc/init.d/rtirq - this installs the script for the system on startup
- Lastly, enter ln -s /etc/init.d/rtirq /sbin/rcrtirq -this turns the script into a command
Now when you enter rcrtirq you'll get
Usage /sbin/rcrtirq {[re]start|stop|reset|status}
You can only use the command as root unfortunately, but it doesn't matter because this script will now start when you switch your computer on - which means you don't have to think about it!
WIDGETIZE