debian 8 rt kernel

debian 8 rt kernel

[luca paganotti]

Hi all, I'm new to debian and I would like to install an rt kernel on
my debian 8 jessie machine, I've configured the pengutronix repository
in my /etc/apt/sources.list.d as:
deb http://debian.pengutronix.de/debian jessie main contrib non-free
in pengutronix.list file, but I don't know which packages I need to
install. I would like to use the rt kernel for my musical work with
jack, ardour, etc ...

Thank you for any answer.

Bye

Re: debian 8 rt kernel

[Alexander Dahl]

[-- Attachment #1: Type: text/plain, Size: 1547 bytes --]

Hei hei,

On Tue, Dec 20, 2016 at 10:01:26AM +0100, luca paganotti wrote:
> Hi all, I'm new to debian and I would like to install an rt kernel on
> my debian 8 jessie machine, I've configured the pengutronix repository
> in my /etc/apt/sources.list.d as:
> deb http://debian.pengutronix.de/debian jessie main contrib non-free
> in pengutronix.list file, but I don't know which packages I need to
> install. I would like to use the rt kernel for my musical work with
> jack, ardour, etc ...

I had a look at this package repository and it contains only very old
kernels, 2.6.29, 2.6.31 and 2.6.33. If you are on jessie, you may want
to try linux-image-rt-686-pae or linux-image-rt-amd64 from backports
which depends on a more recent 4.8 rt kernel. I'm not sure why
pengutronix still allows access to those outdated kernels.

Besides: I used jack some time ago on Debian and some packages for
music, which were available in previous Debian releases are not
available anymore. Also the default sound setup is not optimized for
audio production, as far as I could tell and what I heard and saw, I
would have a look for a specialised Linux distribution like Ubuntu
Studio, AVLinux, or KXStudio (there are more, use a search engine).

Greets
Alex

-- 
»With the first link, the chain is forged. The first speech censured, 
the first thought forbidden, the first freedom denied, chains us all 
irrevocably.« (Jean-Luc Picard, quoting Judge Aaron Satie)
*** GnuPG-FP: C28E E6B9 0263 95CF 8FAF  08FA 34AD CD00 7221 5CC6 ***

[-- Attachment #2: Type: application/pgp-signature, Size: 819 bytes --]

Re: debian 8 rt kernel

[Robert Schwebel]

[-- Attachment #1: Type: text/plain, Size: 1406 bytes --]

On Fri, Jan 13, 2017 at 08:52:15AM +0100, Alexander Dahl wrote:
> On Tue, Dec 20, 2016 at 10:01:26AM +0100, luca paganotti wrote:
> > Hi all, I'm new to debian and I would like to install an rt kernel on
> > my debian 8 jessie machine, I've configured the pengutronix repository
> > in my /etc/apt/sources.list.d as:
> > deb http://debian.pengutronix.de/debian jessie main contrib non-free
> > in pengutronix.list file, but I don't know which packages I need to
> > install. I would like to use the rt kernel for my musical work with
> > jack, ardour, etc ...
> 
> I had a look at this package repository and it contains only very old
> kernels, 2.6.29, 2.6.31 and 2.6.33. If you are on jessie, you may want
> to try linux-image-rt-686-pae or linux-image-rt-amd64 from backports
> which depends on a more recent 4.8 rt kernel. I'm not sure why
> pengutronix still allows access to those outdated kernels.

There are people out there who still rely on those (maybe with
questionable reasons, who knows). If you don't have one of those, please
use the latest and greatest.

rsc
-- 
Pengutronix e.K.                           |                             |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0    |
Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |

[-- Attachment #2: signature.asc --]
[-- Type: application/pgp-signature, Size: 173 bytes --]

Re: debian 8 rt kernel

[Ralf Mardorf]

On Fri, 13 Jan 2017 08:52:15 +0100, Alexander Dahl wrote:
>Ubuntu Studio

Hi,

I'm an Arch Linux user, but I'm helping users with Ubuntu flavours,
including Ubuntu Studio.

The Ubuntu repositories provide a so called "lowlatency" kernel,
without the rt patch. I doubt that this is much better than a vanilla
kernel with threadirqs as boot option. It's easy to build the linux-rt
packages for Ubuntu flavours, but Ubuntu Studio has got other pitfalls,
too.

Ubuntu Studio is a distro for artists, it's not optimised for
musicians. The default is a jackdbus-pulseaudio mix/mess. While I'm an
Arch user, I anyway set up a tailored Ubuntu install, based upon a
minimal install from a server image.
The Ubuntu policy is to start all services provided by package, so the
user needs to disable all unwanted services, even when starting with a
minimal install, but at least such an install doesn't come with
pulseaudio and you could chose jackd instead of jackdbus.

I recommend against Ubuntu Studio, if a user should be unwilling to
check everything on her own and unwilling to set up everything on her
own. You even can't be sure that somebody really cares that rtirq and
the used kernel fit to each other.

Btw. there's nothing wrong with even using a vanilla kernel with
threadirqs as boot option. In regards to audio latency and MIDI jitter
there are a lot of things to consider, e.g. unbinding USB ports that
share unfavourable IRQs, caring about the CPU frequency handling ...

In my more than a decade of Linux audio experiences IMO the best
approach is to set up everything on your own, by optimizing several
settings. Without knowing all "audio distros" I anyway recommend
against just installing an "audio distro". In my experiences the work
that has to be done by the user is the same for "normal" distros and
"audio distros".

YMMV!

Regards,
Ralf

Re: debian 8 rt kernel

[Daniel Vidal]

Hi.

I compile and pack a rt patched kernel for the newest longterm kernel.
Now i run 4.4.38 with rt49 patch.

x64-v3:~$ uname -a
Linux x64-v3 4.4.38-rt49 #1 SMP PREEMPT RT Mon Dec 19 10:28:46 CET
2016 x86_64 GNU/Linux
x64-v3:~$

Is a blobed kernel (not strict free kernel).

if someone send me a site or FTP to upload i can share the packages.

I build bin, headers and source packages.

sorry for my english.

2017-01-13 11:36 GMT+01:00 Ralf Mardorf <ralf.mardorf@alice-dsl.net>:
> On Fri, 13 Jan 2017 08:52:15 +0100, Alexander Dahl wrote:
>>Ubuntu Studio
>
> Hi,
>
> I'm an Arch Linux user, but I'm helping users with Ubuntu flavours,
> including Ubuntu Studio.
>
> The Ubuntu repositories provide a so called "lowlatency" kernel,
> without the rt patch. I doubt that this is much better than a vanilla
> kernel with threadirqs as boot option. It's easy to build the linux-rt
> packages for Ubuntu flavours, but Ubuntu Studio has got other pitfalls,
> too.
>
> Ubuntu Studio is a distro for artists, it's not optimised for
> musicians. The default is a jackdbus-pulseaudio mix/mess. While I'm an
> Arch user, I anyway set up a tailored Ubuntu install, based upon a
> minimal install from a server image.
> The Ubuntu policy is to start all services provided by package, so the
> user needs to disable all unwanted services, even when starting with a
> minimal install, but at least such an install doesn't come with
> pulseaudio and you could chose jackd instead of jackdbus.
>
> I recommend against Ubuntu Studio, if a user should be unwilling to
> check everything on her own and unwilling to set up everything on her
> own. You even can't be sure that somebody really cares that rtirq and
> the used kernel fit to each other.
>
> Btw. there's nothing wrong with even using a vanilla kernel with
> threadirqs as boot option. In regards to audio latency and MIDI jitter
> there are a lot of things to consider, e.g. unbinding USB ports that
> share unfavourable IRQs, caring about the CPU frequency handling ...
>
> In my more than a decade of Linux audio experiences IMO the best
> approach is to set up everything on your own, by optimizing several
> settings. Without knowing all "audio distros" I anyway recommend
> against just installing an "audio distro". In my experiences the work
> that has to be done by the user is the same for "normal" distros and
> "audio distros".
>
> YMMV!
>
> Regards,
> Ralf
> --
> To unsubscribe from this list: send the line "unsubscribe linux-rt-users" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html