[PlanetCCRMA] rt kernel problems

Bengt Månsson bengt.mansson at gmail.com
Sat Apr 6 12:01:14 PDT 2013

Hi folks,
Again I have to call out for some advice.

Here is what I've done:
- Installed fresh from f18 xfce live dvd (simple partitioning with ext4)
- Installed repos for ccrma and rpmfusion
- updated everything except kernel (which is now 3.6.10)
(when I tried that in one go it didn't work at all. I started fresh again
and updated in pieces; first everything except kernel and xorg, then xorg).
- removed pulsaudio
- added a /etc/modprobe.d/local.conf to fix the ordering of sound devices
- used realTimeConfigQuickScan and follow advice
- run alsamixer to set the volumes
- otherwise I think I kept everything default

With this system, I can start (in order) qjackctl, jackd, qsynth and
I can play some simple stored music. With a processor load of 5% (according
to qjackctl) I can get a latency around 10 ms without problems with xrun

Not impressed. I would like to run more stuff with less latency, so I try
to install the rt kernel (3.8.4) and rtirq.

This configuration starts, but it's completely useless. I start qjackctl
and jackd and it looks ok. I start qsynth and try to start rosegarden. The
latter never starts and the machine start to behave very strange in many
ways. Windows can be moved but the app inside is not responding. Windows
turning white. When i try commands in the terminal some can work but other
say "Input/output error" or "read-only file system". Only way to restart is
power-off the hard way.

I have started again with the stock 3.6.10 kernel and the machine is
working again, but without the performance I would like to see.

Anyone have any advice?

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