[LAT] Fwd: [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 - 7:36 pm

My response only got sent to Fernando. Here it is for all of you to see :)

/Lars

---------- Forwarded message ----------
From: Lars-Erik Helander
Date: 2009/2/2
Subject: Re: [LAT] [LAU] Are RT-patches needed anymore? (Was Re: >=
2.6.27 RT ETA?)
To: Fernando Lopez-Lezcano

Fernando your elaborate response is highly appreciated, thanks!!

>> - Will "rtirq" make a difference on a non-RT-patched kernel system?

This was my thought to.

>> - Do I need to assign rtprios explicitly to all my processes

I use "lmms" every now and then. I have never been able to get "lmms"
to work well with jack so I use it with ALSA as the audio driver. This
works fine though I can not use jack application simultaneously. So in
this case do I have to explicitly give "lmms" SCHED_FIFO and rtprio?
How (using chrt?) ?

>> I have close to 30 years experience in developing realtime systems and

About a week ago building from the git produced a kernel that did not
boot properly, actually it did not even build properly and my own
remedy for the build problem resulted in a kernel that was not able to
boot up properly. However building from the git this weekend produced
a well working kernel. Only problem found is the softirq.c bug that
has been around for a while (it makes USB MIDI keyboards etc not to
work - they are discovered but no MIDI events are received) so I had
to apply a patch for that problem.
Build procedure was very straightforward using the git url I cloned
the git and got myself a complete (already "patched" kernel source
tree) and it was just to do the normal "make oldconfig", "make
menuconfig" ... procedures.

>> However I have no experience in using newer non-RT

I have also sucsessfully built and used 2.6.26.8-rt13 with the Slitaz
(www.slitaz.org) distribution (the git kernel also works with that
distribution).
In order to use the kernel with my USB MIDI devices I had to apply the
above mentioned softirq.c patch.

/Lars
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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: >..., 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)