Kubuntu 10.10 and real-time kernel

[Alexandros Bitoulas]

Στις Κυρ 27 Φεβ 2011 00:17:23 Hartmut Noack γράψατε:
> Am 26.02.2011 21:52, schrieb Scott Lavender:
> > On Sat, Feb 26, 2011 at 2:16 PM, Alexandros 
Bitoulas<albitoulas at yahoo.gr>wrote:
> >> Hello everybody!
> > 
> > Hi Alexandros!
> > 
> >> I run kubuntu 10.10 with 2.6.35-25-generic kernel and I am very pleased
> >> and enthusiast about it's aesthetic feel.
> >> 
> >> However, I want to record live my guitar. With this kernel, the latency
> >> that I
> >> get in Jack, (with 512 frames/period, 44100 Sample Rate and 2
> >> Periods/Buffer)
> >> is 23.2 msec which is a little bit annoying. If I lower the Frames to
> >> 256 I get 11.6 but I have many Xruns.
> > 
> > it would be helpful to know what you audio interface is to perhaps help
> > you get better performance.
> > 
> > Also, in some cases (and yours might be one) if you add the user to the
> > 'audio' group it helps performance as well.
> > 
> >> So, I am thinking to install the realtime kernel. The question is: are
> >> Kubuntu
> >> 10.10 and real-time kernel full compatible with each other? Do I need to
> >> make
> >> any considerations/modifications in my system before installing the
> >> real-time
> >> kernel. Did anyone had any problems with Kubuntu 10.10 and real-time
> >> kernel?
> > 
> > Good question.  But since it's all based on Ubuntu I wouldn't expect much
> > deviation in performance except in specific, restricted cases.
> > 
> >> I searched on the web and I only found some generic comments like "that
> >> KDE isn't suitable for audio production", but with no serious support
> >> that validate those comments.
> > 
> > I think many people would argue with that position.
> 
> KDE is not as "light" in terms of memory/CPU-usage as Fluxbox but if one
> disabeles the desktop-search-system, KDE will have little impact on the
> audio-performance.
> Kernel and System-Setup are really important. If a capable basic-system
> is set up carefully, the desktop-system does not matter much. Running
> KDE instead of Fluxbox will not have much more impact than another Synth
> started in a session.
> 
> I use to run KDE4.3 under Suse 11.2 with jengelh-RT-kernel on my
> quad-core workstation and tested the same system with Fluxbox and LXDE
> also. I did not see any improvement of performance so I stuck with KDE
> for convenience ;-)
> 
> best regs
> 
> HZN
> 

Hello Hartmut!

All right, this is valuable information/experience! Thanks for sharing!

Alex

> > A good friend created and maintains that KXStudio distro which is based
> > on Ubuntu Studio and uses KDE.  It's brilliant and beautiful and
> > includes a -realtime kernel I believe.  It's a live DVD so I would
> > highly recommend researching it.  You can find it here:
> > http://kxstudio.sourceforge.net/
> > 
> >> I am looking forward to your replies and comments!
> >> 
> >> Thank you in advance,
> >> 
> >> Alex
> >> 
> >> --
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> > 
> > ScottL