rakarrack sync tempo with jack x-run

[bart deruyter]

Thanks for the info,

by testing, error and trial, it seems to be fixed so far by using jackd -c
s. I've figured out my chipset has no hpet.

I've edited a config file to give ohci1394 higher priorities since my
soundcard is firewire based. But it only had the opposite effect, strangely
enough, so I changed it back to it's default state.

I've managed to set the frequency scaling to 'performance' by default. My
machine is no laptop, so I think that shouldn't be an issue for the
temperature, apart from power consumption :-).

I also noticed rakarrack caused errors x-runs, just by handling it's
interface, moving a slider, clicking on a button. I don't know why, it was
no problem in the past. Anyways, starting jackd with -c s was a major
improvement so far.

Grtz,

Bart
http://www.bartart3d.be/


2011/12/7 Gustin Johnson <gustin at meganerd.ca>

> hpet  is a hardware timer included on most machines since 2005
> (http://en.wikipedia.org/wiki/High_Precision_Event_Timer)
>
> This is generally what I use.
>
> You may also want to disable frequency scaling as I have noticed that
> xruns seem to occur when the CPU changes frequencies.  There should be
> an applet for that (there was under Gnome).  I use KDE which does not
> seem to have such an applet, so I wrote a quick little script to
> handle that.
>
> I also assume that you meant that you have already installed and tweaked
> rtirq?
>
> Hth,
>
>
> On Mon, Dec 5, 2011 at 3:02 PM, bart deruyter <bart.deruyter at gmail.com>
> wrote:
> > Hi all,
> >
> > I've managed to set up my system oneiric, 64 bit to run fairly well,
> though
> > I have noticed I still have a problem with a certain setup.
> >
> > When using two instances of rakarrack, and hydrogen, I let hydrogen run
> > through one instance of rakarrack, then one input of my sound card for my
> > guitar through the other instance of rakarrack.
> >
> > This works fairly well, but then I set hydrogen as sync master, and
> enable
> > the tempo sync from rakarrack to jack and I start to get x-runs.
> >
> > Is there something I can do to improve my system apart from those on the
> > linuxmusicians wiki?
> >
> > I already modified the settings for IRQ handling, and set ohci1394 (sound
> > card is firewire based) as second in the list too.
> >
> > I've read something about the clocksource in the man page of jackd, but I
> > don't understand what it means. clocksource cycle, hpet and system are
> the
> > options. What does this mean, and what would be recommended. Could this
> flag
> > in jackd improve performance?
> >
> > I already use xfce too by the way.
> >
> > grtz,
> > Bart
> > http://www.bartart3d.be/
> >
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