[linux-audio-user] 2.6.15.4, realtime-lsm, jackd -R, system performance down!

[Lee Revell]

On Sun, 2006-02-12 at 11:11 -0800, Sean Edwards wrote:
> Have you tried running jackd as root?  This would also
> require you to run all your jack applications as root
> as well.


How could this possibly change anything?  jackd -R *already works*.
It's not like it's going to "work better" as root - either you are in
realtime mode or you are not.  There's no intermediate state.

Lee


> --- Ismael Valladolid Torres <ivalladt at punkass.com>
> wrote:
> 
> > I just compiled a vanilla kernel 2.6.15.4 in my G3
> > powerpc. Also I
> > compiled, installed and loaded the realtime-lsm
> > module and I started
> > to play with jackd -R and some jack enabled
> > applications.
> > 
> > If I start jackd without realtime, everything runs
> > nicely, of course
> > with some xruns when I switch windows, manipulate
> > GUIs and such. This
> > is more or less what I expected.
> > 
> > But then I run jackd realtime using qjackctl. I
> > start amsynth and it
> > takes a bit longer to load but then runs without a
> > mess. Sound is
> > clean, no artifacts, no xruns.
> > 
> > Then I try horgand. It takes a lot for it to load,
> > then it sounds
> > nicely, I get no xruns, but my X Window system
> > becomes unresponsive.
> > 
> > Later I try zynaddsubfx. It takes half an hour to
> > open, and then it
> > kills qjackctl, leaving the jack server running.
> > Meanwhile top shows
> > that zynaddsubfx is taking 35% of memory, and
> > qjackctl and jackd 25%
> > each.
> > 
> > Could this be an issue with the applications, with
> > the kernel, with
> > the realtime-lsm module, with priority of my X
> > Window session?
> > 
> > I must insist this only happens when jackd is run
> > with the -R option.
> > 
> > Is it true that realtime-lsm is deprecated? How do I
> > enable realtime
> > preemption on a 2.6.15?
> > 
> > Any ideas welcome.
> > 
> > Cordially, Ismael
> > -- 
> > Dropping science like when Galileo dropped his
> > orange
> > 
> >      http://lamediahostia.blogspot.com/
> >      http://www.flickr.com/photos/ivalladt/
> > 
> > 
> 
> 
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