[linux-audio-user] getting my priorities straight

From: Atte André Jensen <atte.jensen@email-addr-hidden>
Date: Fri Apr 21 2006 - 18:41:10 EEST

Hi

Sorry for cross posting, but I figured the solution to my problem could
be with both csound and my linux/kernel setup, so here goes:

When running csound5 under X I get "WARNING: Buffer underrun in
real-time audio output" from csound accompanied by a click, whenever I
"do something", including tab'ing from xterm to xterm. Looking at top I
figure a solution would be to have csound run with lower nice value or
higher priority. Is that a viable solution?

If so, where do I change these settings and which should I change and to
what?

I have this in my .csoundrc:
-+rtaudio=alsa
-o devaudio:hw:1
--sched
--expression-opt
-b 64
-B 256
-d
-m 7
-M 0

I have a patched 2.6.15.6-rt21 kernel and run debian/stable on a pentium
4, 2.4GHz laptop with a edirol UA1A usb soundcard. I didn't "do
anything" with my IRQ's since I don't know how to or if it's nessecary...

Here's a snapshot of the beginning of top:

Tasks: 91 total, 2 running, 89 sleeping, 0 stopped, 0 zombie
Cpu(s): 44.9% us, 31.6% sy, 0.0% ni, 23.6% id, 0.0% wa, 0.0% hi, 0.0% si
Mem: 514848k total, 365216k used, 149632k free, 24720k buffers
Swap: 1004052k total, 0k used, 1004052k free, 208536k cached

   PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND

  5704 atte 15 0 34968 32m 1872 S 48.9 6.4 0:34.13 csound

  1617 root -43 -5 0 0 0 S 25.3 0.0 0:02.91 IRQ 10

   777 root -49 -5 0 0 0 S 1.3 0.0 0:02.17 IRQ 8

     2 root -2 0 0 0 0 S 0.3 0.0 0:00.36
softirq-high/0
  1797 root -42 -5 0 0 0 S 0.3 0.0 0:16.23 IRQ 5

  3177 root 15 0 99568 31m 2932 S 0.3 6.2 3:11.25 XFree86

     1 root 16 0 1584 516 452 S 0.0 0.1 0:00.15 init

     3 root -2 0 0 0 0 S 0.0 0.0 0:00.03
softirq-timer/0
     4 root -2 0 0 0 0 S 0.0 0.0 0:00.00
softirq-net-tx/
     5 root -2 0 0 0 0 S 0.0 0.0 0:01.90
softirq-net-rx/
     6 root -2 0 0 0 0 S 0.0 0.0 0:00.00
softirq-scsi/0
     7 root -2 0 0 0 0 S 0.0 0.0 0:06.63
softirq-tasklet
     8 root 5 -10 0 0 0 S 0.0 0.0 0:00.02 desched/0

     9 root -2 -5 0 0 0 S 0.0 0.0 0:00.29 events/0

    10 root 14 -5 0 0 0 S 0.0 0.0 0:00.00 khelper

    11 root 11 -5 0 0 0 S 0.0 0.0 0:00.00 kthread

    13 root 10 -5 0 0 0 S 0.0 0.0 0:00.02 kblockd/0

-- 
peace, love & harmony
Atte
http://www.atte.dk      | quartet:      http://www.anagrammer.dk
http://www.atte.dk/gps  | compositions: http://www.atte.dk/compositions
Received on Fri Apr 21 20:15:09 2006

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