18 Mar
2008
18 Mar
'08
4:49 p.m.
There is really no reason that I know of that you cannot build this
kernel yourself. It's not horribly difficult once you've done it a few
times. It can be quite daunting when you're up to bat for the first
time though. the trick is understanding what driver modules you are
using and making sure all of those are included in the configuration
of your new kernel. Once you get past that step it's just a matter of
adding a new option in the grub config file and trying it out.
From the RTWiki these are the commands to download and
patch a kernel:
# wget ftp://ftp.kernel.org/pub/linux/kernel/v2.6/linux-2.6.23.1.tar.bz2
# wget http://www.kernel.org/pub/linux/kernel/projects/rt/patch-2.6.23.1-rt11.bz2
# tar xfj linux-2.6.23.1.tar.bz2
# cd linux-2.6.23.1
# bzcat2 ../patch-2.6.23.1-rt11.bz2 | patch -p1
The above is for 2.6.23. If you were going to do it you might as well
go for 2.6.24.
Changing the kernel itself should not cause any changes in the
stability of your applications. They really exist at a higher level
and just talk to the kernel underneath it. If a new minor revision
kernel upgrade breaks an application I think it would generally be
considered a regression in the kernel and would get fixed. I have
kernels ranging back to 2.6.14. they all work.
Hope this helps,
Mark
On Tue, Mar 18, 2008 at 12:41 PM, Arda Eden <ardaeden(a)gmail.com> wrote:
I'm a PARDUS (a Turkish GNU/Linux distro) user so
that the latest kernel
provided by my distro developers is 2.6.18.8-86. I can't know why they don't
complile a new one but i think that it's about the stability of most
applications provided by thet distro.
Which distro of Linux is most suitable for most linux audio applications ?
On Tue, Mar 18, 2008 at 9:36 PM, Mark Knecht <markknecht(a)gmail.com> wrote:
--
Arda EDEN
Cumhuriyet University
Faculty of Fine Arts
Department of Music Technology
Sivas/TURKEY
That kernel is getting pretty old. I'm
running 2.6.24-rt1 here. you
might want to check out the RT-Wiki or some of the sites for using RT
kernels with audio apps.
http://rt.wiki.kernel.org/index.php/Main_Page
The above link gives instructions for patching a kernel to get to an RT
kernel.
Hope this helps,
Mark
On Tue, Mar 18, 2008 at 12:02 PM, Arda Eden <ardaeden(a)gmail.com> wrote:
> Hmm,
> So this is all about my kernel:
> Linux melinda 2.6.18.8-86 #2 SMP Mon Feb 11 00:50:59 EET 2008 i686
mobile
> AMD Athlon(tm) XP-M 2200+ GNU/Linux
>
> Is it possible to patch it in order to make it a RT kernel ?
>
>
> On Tue, Mar 18, 2008 at 8:59 PM, Mark Knecht <markknecht(a)gmail.com>
wrote:
> >
> > On Tue, Mar 18, 2008 at 11:41 AM, Arda Eden <ardaeden(a)gmail.com>
wrote:
> > > So what does a realtime kernel
change ? Makes my latency 1 ms ?
> > >
> > >
> > >
> > >
> > > On Tue, Mar 18, 2008 at 8:38 PM, Arnold Krille
<arnold(a)arnoldarts.de>
> wrote:
> > >
> > > >
> > > >
> > > >
> > > > Am Dienstag, 18. März 2008 schrieb Mark Knecht:
> > > >
> > > > > On Tue, Mar 18, 2008 at 11:25 AM, Arda Eden
<ardaeden(a)gmail.com>
> wrote:
> > > > > > So is it really necessary to have a realtime kernel in
order
to
> use
> > > linux
> > > > > > audio applications without any latencies or xruns ?
> > > > > It is not possible to use ANY kernel with NO latencies. EVERY
kernel
> > > > > has latencies. The
question is how low do you want the latencies
to
> > > > > be? If you can exist
with 50mS or higher you might get away with
a
> > > > > standard kernel. If you
want to run with 1.2mS latency then you
will
> > > > > absolutely have to have
a real-time enabled kernel.
> > > >
> > > > Still it has to be noted that you can achieve 5ms latency without
a
> > RT-kernel... Even with an el-cheapo builtin
soundcard...
> >
> > Arnold
Absolutely. The most recent kernels are often quite good. However I
would say that the difference between a standard kernel running 5mS
and a RT kernel running 5mS is that the RT kernel is far more likely
to meet the 5mS requirement under heavy system loads while the
standard kernel may, at times, give a bit too much time to non-rt
threads and not get back to your audio thread as fast as someone might
want.
If you want the highest reliability means of meeting your RT
requirements all the time then use the RT kernel. If you are just
doing home recording and can accept an occasional xrun (i.e. - a
glitch in the recorded data) then stick with the standard kernel for
as long as it works for you.
Just my view,
Mark
--
Arda EDEN
Cumhuriyet University
Faculty of Fine Arts
Department of Music Technology
Sivas/TURKEY