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Revision as of 07:13, 21 May 2007 by Gimpel (Talk | contribs)
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Overlay specific

I want to contribute! What do I have to do?

Evermind wrote a nice guide on how to work with and contribute to the overlay. Please read the guide first, if you still have questions feel free to ask on the Mailing List


we use standard gentoo ebuild scheme for snapshot ebuilds. So there will be no longer ebuilds named: foo-cvs-1.ebuild Instead they are named foo-9999.ebuild
e.g. to compile the latest rosegarden svn checkout you now have to do the following:

echo "media-sound/rosegarden **" >> /etc/portage/package.keywords
emerge rosegarden

KEYWORDS="-* is no longer valid
to upgrade your /etc/portage/package.keyword you could run 'convert_live_keywords' inside the overlay root

./convert_live_keywords -cp
If you get messages about *-cvs/svn "Blocked Packages" remove the blocked one and try again

Technical Questions

RT Kernel, realtime-lsm ...wtf?

just to clear that out again.. people tend to confuse the realtime-lsm kernel module with the realtime-preemption kernel patch

realtime-lsm is nothing else but a linux security module (LSM) which makes it possible to grant users access to the realtime capabilities of the Linux kernel. It works on any kernel. This is going to be replaced by PAM's pam_limits.so which uses the kernel's RLIMITS feature to allow users access to the realtime capabilities in a more secure way than realtime-lsm does.

realtime-preemption is a feature provided by a kernel patch from Ingo Molnar. It makes the kernel fully preemtible which reduces latencies, especially on audio tasks. A kernel patched with the realtime-preemption patch is called RT-kernel. This has to do with CPU scheduling, but nothing with user permissions.

Intel HDA and lots of xruns?

The Intel HDA chips tend to suffer some problems when used with jackd. So if you get tons of xruns with your HDA chip, try setting the Periods/Buffer value to 3 in qjackctl, or commandline:

jackd -dalsa -n3
If that still does not help, try turning off realtime.

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