On 06/14/2011 03:19 PM, Orcan Ogetbil wrote:
On Tue, Jun 14, 2011 at 6:11 PM, Fernando Lopez-Lezcano wrote:
> 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 126.96.36.199
> 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.
I read but not tried that passing the argument
to the kernel at boot should load upstart. I have not tried it myself though.
Looks like that is a workaround (Richard Brown mentioned it to me on an
off-list email yesterday). I tried it (first yum install upstart if you
don't have it), adding init=/sbin/upstart allows the machine to boot
fine. There are some audit errors printed that were not there before but
things seem to work.