#7603 HIGH 8.2.0 (: 2.6.25 audio performance regression

[Zarro Boogs per Child]

#7603: 2.6.25 audio performance regression
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   Reporter:  dsd       |       Owner:  dilinger                           
       Type:  defect    |      Status:  new                                
   Priority:  high      |   Milestone:  8.2.0 (was Update.2)               
  Component:  kernel    |     Version:  not specified                      
 Resolution:            |    Keywords:  joyride-2181:- 8.2.0:? blocks:8.2.0
Next_action:  diagnose  |    Verified:  0                                  
  Blockedby:            |    Blocking:                                     
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Comment(by veplaini):

 I just want to point out that performance is still not to the previous
 release standard. My tests with a MIDI activity show that whilst with the
 previous release
 I got no xruns, with 2301 I am getting about 2-3 a minute. By increasing
 the
 buffer size I can remove these, at the expense of interactivity (not a
 problem
 here, but possibly elsewhere). This is of course much better than before
 the
 changes to the kernel.

 If there is no time to test changes to Rainbow to allow scheduler priority
 changing,
 there is nothing more we can do. We should then defer further work to the
 next release, when we might try more agressive preemption in the kernel
 with RT patches.

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Ticket URL: <http://dev.laptop.org/ticket/7603#comment:69>
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