[PlanetCCRMA] fedora 15 vs. the rt kernel

Fernando Lopez-Lezcano nando at ccrma.Stanford.EDU
Tue Jun 14 15:11:30 PDT 2011

Hi all, just a couple of comments about rt patched kernels and Fedora 15.

In short, it looks like 2.6.33.x is too old to work with the new systemd 
startup system in Fedora 15. While I did manage to boot, shutting down 
did not work (at least not cleanly) and others have not been able to 
even boot "legacy" 2.6.33.x-rtxx kernels in Fedora 15. Apparently this 
is the issue:


So, for now the only option seems to be to use the newest 
kernel with threaded irqs active. This is _not_ a fully rt patched 
kernel and my initial tests with the cyclictest utility show higher 
latency hits than rt31. I'm currently building and testing packages.

Another option would be to revert (for now) from systemd to the previous 
startup scripts. I don't know if that is even possible, maybe others in 
the lists would be able to comment.

-- Fernando

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