Re: [LAT] [LAU] RT patch not needed for new kernels (?)

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To: Grammostola Rosea <rosea.grammostola@...>
Cc: <linux-audio-tuning@...>, <Linux-audio-user@...>
Date: Wednesday, November 26, 2008 - 11:45 pm

On Thu, 2008-11-27 at 00:07 +0100, Grammostola Rosea wrote:

And were did you hear those "rumors"? Source? URL? etc?

As usual, it depends. What does "realtime" mean to you?

Very low latencies?[*] Then you _will_ need the realtime preemption
patches or you will have to live with xruns. Not so low latencies?
Vanilla kernels > 2.6.26 will probably work just fine.

It also depends on what hardware mixture you have on your computer and
how it is (or is not) tuned.

A caveat is that the realtime preemption patches for 2.6.26.x don't seem
to work too well (midi problems when used with external controllers).
And for 2.6.27.x there is nothing even usable yet (last time I looked).
The latest "stable" preemption patches are for 2.6.24.x, which is
regretfully now too old for many hardware configurations (and even for
some software, like the newer X servers).

In both cases you will need a working Jack and you will need to run it
with realtime priority (which has nothing to do with the realtime
preemption patches).

Hmmm, so am I now perpetuating the rumor? :-)
-- Fernando

[*] 5-10 mSecs? There is no hard boundary...

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Messages in current thread:
[Linux-audio-tuning] New Linux-audio-tuning mailing list, Daniel James, (Tue Jul 29, 11:43 am)
[LAT] Tickless kernel and realtime, Maurizio De Cecco, (Fri Sep 12, 1:20 pm)
[LAT] RT patch not needed for new kernels (?), Grammostola Rosea, (Wed Nov 26, 11:07 pm)
[LAT] Fwd: [LAU] Are RT-patches needed anymore? (Was Re: &gt..., Lars-Erik Helander, (Mon Feb 2, 7:36 pm)
[LAT] 2.6.29-rt1, Robin Gareus, (Thu Mar 26, 6:52 pm)
Re: [LAT] Setting up a performance synth, Brian Bergstrom, (Thu Jan 14, 6:17 pm)
Re: [LAT] To much latency, Jeremy Jongepier, (Thu Nov 3, 8:22 pm)
Re: [LAT] 2.6.29-rt1, Fernando Lopez-Lezcano, (Thu Mar 26, 8:40 pm)
Re: [LAT] 2.6.29-rt1, Robin Gareus, (Thu Mar 26, 9:21 pm)
Re: [LAT] 2.6.29-rt1, Fernando Lopez-Lezcano, (Fri Mar 27, 5:23 pm)
Re: [LAT] 2.6.29-rt1, , (Fri Mar 27, 7:09 pm)
Re: [LAT] 2.6.29-rt1, Robin Gareus, (Fri Mar 27, 5:27 pm)
Re: [LAT] 2.6.29-rt1, , (Fri Mar 27, 12:57 pm)
Re: [LAT] 2.6.29-rt1, Robin Gareus, (Fri Mar 27, 12:59 pm)
Re: [LAT] 2.6.29-rt1, Grammostola Rosea, (Fri Mar 27, 1:02 pm)
Re: [LAT] 2.6.29-rt1, , (Thu Mar 26, 8:13 pm)
Re: [LAT] 2.6.29-rt1, Robin Gareus, (Thu Mar 26, 8:30 pm)
Re: [LAT] [LAU] RT patch not needed for new kernels (?), Fernando Lopez-Lezcano, (Wed Nov 26, 11:45 pm)
Re: [LAT] Tickless kernel and realtime, Robin Gareus, (Mon Sep 15, 5:00 pm)
Re: [LAT] Tickless kernel and realtime, Daniel James, (Tue Sep 16, 9:36 am)
Re: [LAT] Tickless kernel and realtime, Jaromír Mikeš, (Wed Sep 17, 10:36 pm)
Re: [LAT] Tickless kernel and realtime, Robin Gareus, (Thu Sep 18, 2:47 pm)
Re: [LAT] Tickless kernel and realtime, Jaromír Mikeš, (Thu Sep 18, 7:42 pm)
Re: [LAT] Tickless kernel and realtime, Emanuel Rumpf, (Sun Sep 14, 12:38 pm)