[LAU] xruns with m-audio fast track pro on fedora 8 ccrma -> kernel 2.6.22 , periods/buffer = 3 , disable system bips and esd, and proper rtirq setup

[Fernando Lopez-Lezcano]

On Wed, 2008-01-23 at 16:44 +0100, Florent Berthaut wrote:
> Florent Berthaut a écrit : 
> > Florent Berthaut a écrit : 
> > > Hartmut Noack a écrit : 
> > > > -----BEGIN PGP SIGNED MESSAGE-----
> > > > Hash: SHA1
> > > > Florent Berthaut schrieb:
> > > > > Fernando Lopez-Lezcano a écrit :
> > > > >     
> > > > > > A more basic question... what parameters are you using when you start
> > > > > > jackd?
> > > > > >       
> > > > > .jackdrc:
> > > > > 
> > > > > /usr/bin/jackd -R -P70 -t1000 -u -dalsa -r44100 -p64 -n2 -D -Chw:0,1 
> > > > > -Phw:0,0 -S -i2 -o2
> > > >
> > > > USB-Devices often perform much better with -n3. Furthermore I would try
> > > > to eliminate any flag, that is not absolutely needed such as:
> > > > 
> > > > /usr/bin/jackd -R -dhw:1 -dalsa -r44100 -p64 -n3
> > > > 
> > > > BTW: this would compute to around 4 ms latency - is that good enough for
> > > > you?
> > >
> > > Okay, i had forgot to turn off the system "bips" and esd (it
> > > reduced the number of xruns)
> > > And yep with -n3 i 've got even less xruns and it seems they're
> > > not audible. 
> > > I don't know if the latency is low enough though, i'll test this
> > > evening with my drum pads.
> > > 
> > > Thanks everyone , it's really great to get so much help so
> > > quickly. 
> > > 
> > Argh, actually i still have audible xruns. And i don't think i'd be
> > able to play correctly with a higher latency anyway...
> > Think i'll have to get back to ubuntu studio ... :( 
>
> Actually after a reboot and some more tweakings, things have been
> running without a xrun for an hour now, even with periods/buffer=2.
> 
> So finally, i'll stay with planet ccrma ;) 

You might want to try the 2.6.22.x based kernel for f8 as stated
somewhere else in the thread. In my experience it has better performance
latency-wise. 

What other tweakings did you do?

-- Fernando