linuxaudio.org

Hello everyone,

  I'm running Ubuntu Jaunty 9.04 (on a different laptop, not the one

running AVLinux). Till recently, my linuxsampler setup on this

particular system was working without (major, noticable) glitches, i.e

very few xruns and not many dropped notes. Since the past few days,

however, I'm seeing a host of xruns and buzzes and drop notes. I tried

switching to the RT kernel (kernel 2.6.28-3-rt, via synaptic). The

result - a *huge*, unmanageable latency. I also noticed this warning

which I'd not seen before:
Thread: WARNING, can't assign realtime scheduling to thread!
I'm using jackdmp 1.9.4, compiled from source:
/usr/local/bin/jackd -S -R -dalsa -dhw:0 -r44100 -p256 -n2
I'm sure there are better realtime kernels out there, but before I

switch the kernel, I'd like to understand why exactly linuxsampler is

not being allocated realtime priority. I don't know much about this.

Incidentally, here's what 'top' reveals: (Note: these are with the

vanilla kernel).
  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+

COMMAND

29516 guru      20   0 35872  13m  10m R 10.3  1.4   0:28.17

qsampler

29503 guru      20   0  437m 436m  76m S  2.7 46.5   0:11.57

linuxsampler

29493 guru      20   0 88632  74m  72m S  2.3  8.0   0:11.20

jackd             
No user-owned entries have RT priority, but down the list some

root-owned processes do, for e.g:

3 root      RT  -5     0    0    0 S  0.0  0.0   0:00.00 migration/0

All user-oned processes have the same priority: 20

My /etc/security/limits.conf file ends with this:

@audio   -  rtprio     19

@audio   -  memlock    unlimited

@audio   -  nice      -19

 And I'm a member of the group 'audio'.
Can someone help me out with this?

Thanks in advance!

Cheers,
Guru
--

Guru Prasad B.R.

Centre for Ecological Sciences

Indian Institute of Science

Bangalore - 560 012

India

Ph:+91-80-22933103
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