[linux-audio-user] Kernel 2.6.15.3-rt tests

Hi,

        I am working with this kernel right now. I compiled it into my
GNU Linux box (Musix 0.30) following:
http://ubuntustudio.com/wiki/index.php/Breezy:Vanilla_Kernel_With_Realtime_Preemption

 And it works fine, but with a few "bugs" or problems.

You can download it from:

http://www.k-maleon.com/musix/deb

Tests:

PC Duron 1800Mhz, 120Mb RAM, HD 7200 RPM, SB Live!

sáb feb 11 18:34:03 CET 2006

Kernel: Musix GNU/Linux, kernel 2.6.15.3-rt-musix-2006-11-02

*rtirq works normally
*Normal users can use RT

*With:
/usr/bin/jackd -R -P89 -t1000 -m -dalsa -dhw:0 -r44100 -p512 -n2 -s -S
-i1

    * Good: Ardour with 7 tracks and a lot of LADSPA FX: it worked well
enough, using jackd in duplex and play only mode (with a 512 buffer,
44100Hz)

    * BAD: into this session, I opened JAMIN and all the system went
very slow. Then I restarted jack into play only mode and it worked
well: I could master the tracks connected to Jamin from Ardour outputs.

lesser buffer size:

    * Regular: JAMIN, jackd duplex, buffer 256, it works fine, but whe i
opened ardour: 4 (28) xruns while the hard disk was reading/writing. I
think that with more ram than my little 120Mb it can do it much better.

    * Fine: jack: 48000 Hz, 1024 or 128 buffer (46ms latency or 5ms
latency), play only mode, Ardour with 7 tracks: NO XRUNs at all.

I opened Jamin and all goes well with 1024 buffer, but with the 128
buffer the system just got paralyzed.

Hope it can help or serve you.

Musix uses the DeMuDi kernel (when installed on HD).

I'm needing to make a RT kernel that could boot from the Live-CD out of
the box, so I am experimenting with it. I could not compile unionfs,
but I will try again in these days.

Cheers,

-- 
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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