[linux-audio-user] Kernel 2.6.15.4-rt tests (+sound samples)

[Marcos Guglielmetti]

Hi, cheers,


Listen to the ogg files from here:
http://www.musix.org.ar/ogg/
1)
http://www.musix.org.ar/ogg/kernel-2.6.15.4-rt_tests_zyn+hydrogen+timemachine-musix_gnu+linux.ogg
2)
http://www.musix.org.ar/ogg/kernel-2.6.15.4-rt_tests_zyn+hydrogen+timemachine+jamin-musix_gnu+linux.ogg

* rtirq status

  PID CLS RTPRIO  NI PRI %CPU STAT COMMAND
  660 FF      90   - 130  0.0 S<   IRQ 8        [........./  0]  rtc
 1099 FF      80   - 120  0.0 S<   IRQ 10       [........./  0]  
uhci_hcd
 1229 FF      79   - 119  0.0 S<   IRQ 5        [........./  0]  
uhci_hcd
 2525 FF      70   - 110  0.0 S<   IRQ 11       [........./  0]  
ehci_hcd
  674 FF      69   - 109  0.0 S<   IRQ 6        [........./  0]  
uhci_hcd
  757 FF      60   - 100  0.0 S<   IRQ 1        [........./  0]  i
  671 FF      59   -  99  0.0 S<   IRQ 12       [........./  0]  i
  692 FF      46   -  86  0.3 S<   IRQ 14       [........./  0]  ide
  695 FF      45   -  85  0.0 S<   IRQ 15       [........./  0]  ide
 1471 FF      41   -  81  0.0 S<   IRQ 4

That works OK
Apps test:

1)
/usr/bin/jackd -R -P89 -t1000 -m -dalsa -dhw:0 -r48000 -p64 -n2 -P -s -S
(2.67 ms latency)

I can play Hydrogen with a heavy (weighted) drum kit, and i had only 1
(2) xruns into JACK (qjackctl)

2)
usr/bin/jackd -R -P89 -t1000 -m -dalsa -dhw:0 -r48000 -p128 -n2 -P -s -S
(5.33 ms latency)

I can play Hydrogen with a heavy (weighted) drum kit, and i had no xruns 
into JACK(qjackctl)
I loaded zynaddsubfx and play with some instruments when listening to 
Hydrogen drums, and had no xruns (that's fine!), but, when i opened 
timemachine to record my demo song, it produced more xruns (whit hard 
disk read/write), so I will use a more conservative setup for jack

3)
/usr/bin/jackd -R -P89 -t1000 -m -dalsa -dhw:0 -r44100 -p256 -n2 -P -s 
-S
(11.6ms latency)

I can play Hydrogen with a heavy (weighted) drum kit, and i had no xruns 
into JACK(qjackctl)
I loaded zynaddsubfx and play with some instruments when listening to 
Hydrogen drums, and had no xruns (that's fine!), then i opened 
timemachine to record my demo song (there were some sound artifacts, 
some clicks when connecting jack virtual cables). 

Ok, press REC into timemachine to record a live jamin and it works just 
fine: no xruns.

3.1)
Then i opened Jamin to master in a live mode.... and it produces 1 (2) 
xruns when loading itself.

When I played my keyboard with zynaddsubfx it produced 3(4) xruns. Then 
when I recorded with timemachine connected to Jamin, it produced 5 (6) 
xruns, but it sounded ok.

* I think that all of these xruns have something to be with HD settings 
and with my 120Mb RAM memory Duron1800Mhz, SB Live!

These test are ok for me... but we must test this kernel into a better 
PC.

Download this kernel from:
http://tapsa.terae.net/linux/knoppix/suomiknoppix/linux-2.6.15.4-rt/

-- 
Marcos Guglielmetti  
Coordinador del desarrollo de Musix GNU+Linux 
(www.musix.org.ar) 
Mirrors: (www.musix.distrux.net) (www.pc-musica.com.ar/musix) 
(www.k-maleon.com/musix)

		
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