[linux-audio-user] IRQ conflicts, acpi, and linux audio

Rui Nuno Capela rncbc at rncbc.org
Sun Nov 20 08:16:12 EST 2005

thewade wrote:
>> If ccrma, I've read there's a package called rtirq which seems to have
>> something to do with re-prioritizing interrupts (in software) though
>> I don't know the details. I think you'd need to be running the planet
>> ccrma kernel (or equivalent) for it to work..
> A (in no way) comprehensive search yields that rtirq is a patch, 
> possibly only to the 2.4 kernel.


The rtirq package is just a simple SysV script, which is targeted to 
prioritize the soft-IRQ handlers on a preempt-realtime enabled kernel 
(i.e. Ingo Molnar's 2.6.x-rt patches). It is specially suited to 
PREEMPT_RT kernels, but it can be of use on PREEMPT_DESKTOP configured ones.

Incidentally I'm the author of the rtirq thingie, which you can find the 
tarball attached (rtirq-20050914.tar.gz). There's no documentation, you 
have to use the source, sorry.

As it was specially crafted for a RPM based distro (e.g. SUSE, Mandriva, 
Fedora) and if you can't have use of the given rtirq.spec, which is 
suited for rpmbuild, installations instructions are the ones as for a 
LSB system, as root:

# cp rtirq.sh /etc/init.d/rtirq
# chmod 0755 /etc/init.d/rtirq

# cp rtirq.conf /etc/sysconfig/rtirq
# chmod 0644 /etc/sysconfig/rtirq

And then, depending on your distro, enable it as a proper init script 
(e.g. use something like `/sbin/chkconfig --add rtirq`). Once installed 
just do either of the following:

# /etc/init.d/rtirq start
# /etc/init.d/rtirq stop
# /etc/init.d/rtirq status

You'll probably get over the semantics of all these ;) Of course, you 
can change the default configuration that you may find in 
/etc/sysconfig/rtirq .

rncbc aka Rui Nuno Capela
rncbc at rncbc.org
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