realtime-preempt-2.6.12-final-V0.7.51-11 glitches

["Rui Nuno Capela" <rncbc@rncbc.org>]

Hi all,

These are one of my latest consolidated results while using (my)
jack_test4.2 suite, against a couple of 2.6.12 kernels patched for
PREEMPT_RT, on my P4@2.5GHz/UP laptop.

See anything funny?

As it seems, the kernel latency performance is in some unfortunate
regression, and I'm experiencing this unsatisfactory behavior ever since
the latest RT-V0.7.50-xx patch series.

  ------------------------------ ------------- -------------
                                 RT-V0.7.51-11 RT-V0.7.49-01
  ------------------------------ ------------- -------------
  Total seconds ran . . . . . . :      900           900
  Number of clients . . . . . . :       14            14
  Ports per client  . . . . . . :        4             4
  Frames per buffer . . . . . . :       64            64
  Number of runs  . . . . . . . :        1             1
  ------------------------------ ------------- -------------
  Failure Rate  . . . . . . . . :   (    0.0 )    (    0.0)  /hour
  XRUN Rate . . . . . . . . . . :      373.3           0.0   /hour
  Delay Rate (>spare time)  . . :      220.0           0.0   /hour
  Delay Rate (>1000 usecs)  . . :        0.0           0.0   /hour
  Delay Maximum . . . . . . . . :     7853           295     usecs
  Cycle Maximum . . . . . . . . :      852           943     usecs
  Average DSP Load. . . . . . . :       41.8          44.4   %
  Average CPU System Load . . . :        6.8          16.3   %
  Average CPU User Load . . . . :       28.8          30.1   %
  Average CPU Nice Load . . . . :        0.0           0.0   %
  Average CPU I/O Wait Load . . :        0.0           0.1   %
  Average CPU IRQ Load  . . . . :        0.0           0.0   %
  Average CPU Soft-IRQ Load . . :        0.0           0.0   %
  Average Interrupt Rate  . . . :     1679.3        1680.4   /sec
  Average Context-Switch Rate . :    12508.6       14463.2   /sec
  ------------------------------ ------------- -------------

JFYI respective kernel configs are also attached.

Cheers.
-- 
rncbc aka Rui Nuno Capela
rncbc@rncbc.org

Attachment: jack_test4.2.tar.gz
Description: application/gzip-compressed

Attachment: config-2.6.12-RT-V0.7.49-01.0.gz
Description: Binary data

Attachment: config-2.6.12-RT-V0.7.51-11.0.gz
Description: Binary data