On Wed, 2008-01-23 at 16:44 +0100, Florent Berthaut wrote:
  

Florent Berthaut a écrit : 
    

Florent Berthaut a écrit : 
      

Hartmut Noack a écrit : 
        

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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