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

alex stone compose59 at gmail.com
Tue Mar 10 09:18:30 EDT 2009

On Tue, Mar 10, 2009 at 4:06 PM, Cassiel <raffaele.morelli at gmail.com> wrote:

> generic or custom (rt patched) kernel?
> r
> 2009/3/10 nescivi <nescivi at gmail.com>
>> realtime priorities were handled through limits.conf, and I am running on
>> the
>> Debian kernel 2.6.26-1-amd64 on a Intel Core2 Duo, T7500 2.20 GHz. (It's a
>> Lenovo Thinkpad T61).
>> The previous Debian kernel 2.6.24, did give me better results with JACK,
>> but
>> had problem with the serial chip driver (the FTDI), at certain baudrates.
>> So yes, the few xruns were problematic, since my soundtrack was the only
>> sound
>> that was going on, and I would really like to know how I could make this
>> whole setup a bit more robust.
>> The video capturing and the visualisation are certainly less time
>> critical, as
>> I am only deriving control data from it, and/or using it to monitor. It is
>> not projected out again.
>> sincerely,
>> Marije
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> Linux-audio-user at lists.linuxaudio.org
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For what it's worth, and i'm certainly not a kernel or linux expert by any
stretch of the imagination, I've just built (via the debian build method) an
RT kernel from vanilla, and Igno's patches, for 2.6.26-(rt16 build). As i
understand it, 2.6.26-rt8, and previous, had a problem with sound and midi.
I did read a discussion about this, in which a clever fellow had built a
patch to remedy the problems, and it was intimated that this patch would be
included in subsequent rt<number> builds.

I don't know if this has happened, but here, on Debian 5 32bit, i'm running
jack2, with Alsa 1.0.19, 128-n3, and have no problems. No xruns, or glitches
so far. (The kernel is still warm from a few days ago).

I have a question related to this.

Is it possible to build a custom RT kenel using 2.6.29, that will work in
Lenny? Is there an incompatability with Glib, or anything else, that will
prevent this happening?


Parchment Studios (It started as a joke...)
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