Re: [LAT] [LAU] Are RT-patches needed anymore? (Was Re: >= 2.6.27 RT ETA?)

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To: <linux-audio-tuning@...>
Date: Monday, February 2, 2009 - 8:53 am

I really appreciate the information provided in this thread. However I
would appreciate if someone could provide a link to some basic
information on the subject since I have found very little information
about using standard kernel features for low-latency.

The kind of questions I do have are:

- What kernel versions are suitable to use (have significant
real-time like characteristics) without applying the rt-patches (...,
2.6.25.*, 2.6.26.*, 2.6.27.*, 2.6.28.*)
(Information on what, in this context, was added in different
versions would of course help)?
- If I take some standard distribution which has a suitable (non-RT)
kernel version, what do I have to do in order to to have some basic
audio apps running nicely?
- Will "rtirq" make a difference on a non-RT-patched kernel system?
- Do I have to use PAM to have non-root users to acquire necessary rtprios?
- What jackd settings are important?
- Do I need to assign rtprios explicitly to all my processes
(qjackctl, qsynth, ...) or is that "automagic"?
- Do I need to modify anything else under /sys or /proc for the
system to use the available rt-like characteristics?

I have close to 30 years experience in developing realtime systems and
has been using Linux for audio in various distribution the last two
years. Further I have built RT-kernel for couple of distributions
(this weekend I successfully built and ran a 2.6.28-rt kernel from the
new git tree :) ). However I have no experience in using newer non-RT
kernels but I am very interested to find out how well you can have
them work, especially since whenever you find a nice distro you can
not use it because the hazzle of building an RT-kernel for that
particular distro is so big :(.

Any knowledge or link that would enlighten me are highly appreciated.

Kind Regards

/Lars

2009/2/2 Robin Gareus :

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Messages in current thread:
[Linux-audio-tuning] test, MarcOChapeau, (Sun Jul 27, 11:34 am)
[LAT] hello, dyne:bolic -rt and freeeee, jaromil, (Wed Sep 10, 2:06 pm)
[LAT] BIOS and IRQ, Grammostola Rosea, (Wed Nov 26, 8:55 pm)
[LAT] Setting up a performance synth, David McClanahan, (Wed Jan 13, 9:55 pm)
[LAT] We're back online !, Marc-Olivier Barre, (Thu Apr 22, 8:10 pm)
[LAT] presonus firebox and 2.6.31-9-rt gives tons of xruns, yvan volochine, (Tue May 18, 10:45 am)
[LAT] Document on using Jack Apps, Arvind Venkatasubramanian..., (Sat Jul 31, 10:23 pm)
[LAT] rt kernel 2.6.39, Emanuel Rumpf, (Sun May 29, 11:56 am)
[LAT] To much latency, Dave Stikkolorum, (Sun Oct 30, 11:02 am)
[LAT] 3.x kernel, Emanuel Rumpf, (Wed May 2, 8:48 pm)
Re: [LAT] 3.x kernel, Robin Gareus, (Wed May 2, 8:51 pm)
Re: [LAT] To much latency, Jeremy Jongepier, (Sun Oct 30, 11:25 am)
Re: [LAT] To much latency, Dave Stikkolorum, (Sun Oct 30, 11:55 am)
Re: [LAT] To much latency, Jeremy Jongepier, (Sun Oct 30, 12:03 pm)
Re: [LAT] To much latency, Dave Stikkolorum, (Sun Oct 30, 12:23 pm)
Re: [LAT] To much latency, Jeremy Jongepier, (Sun Oct 30, 1:50 pm)
Re: [LAT] To much latency, Dave Stikkolorum, (Sun Oct 30, 2:13 pm)
Re: [LAT] To much latency, Jeremy Jongepier, (Sun Oct 30, 2:19 pm)
Re: [LAT] To much latency, Dave Stikkolorum, (Sun Oct 30, 2:39 pm)
Re: [LAT] To much latency, Jeremy Jongepier, (Mon Oct 31, 11:59 am)
Re: [LAT] To much latency, Dave Stikkolorum, (Tue Nov 1, 4:17 pm)
Re: [LAT] To much latency, Jeremy Jongepier, (Wed Nov 2, 5:34 pm)
Re: [LAT] To much latency, Rafael Vega, (Tue Nov 1, 12:25 am)
Re: [LAT] To much latency, Daniel James, (Tue Nov 1, 10:04 am)
Re: [LAT] To much latency, Rafael Vega, (Thu Nov 3, 12:33 pm)
Re: [LAT] To much latency, email.rafa@gmail.com, (Thu Dec 22, 2:50 pm)
Re: [LAT] rt kernel 2.6.39, Robin Gareus, (Sun May 29, 1:43 pm)
Re: [LAT] rt kernel 2.6.39, Emanuel Rumpf, (Sun May 29, 2:39 pm)
Re: [LAT] rt kernel 2.6.39, Robin Gareus, (Mon May 30, 3:52 pm)
Re: [LAT] Document on using Jack Apps, Daniel James, (Tue Aug 3, 6:48 pm)
Re: [LAT] [LAU] Are RT-patches needed anymore? (Was Re: >..., Lars-Erik Helander, (Mon Feb 2, 8:53 am)
Re: [LAT] [LAU] Are RT-patches needed anymore? (Was Re: &gt;..., Fernando Lopez-Lezcano, (Mon Feb 2, 6:35 pm)