#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 dsaxena):

 Replying to [comment:47 dsd]:
 > I patched tamtam, changed to the test kernel and ran my unscientific
 patch. underruns-per-minute reduced from 92 to 76. Then I detatched the
 screen session and close the terminal, and observed 16 underruns per
 minute (vs 8 from my previous measurements). 2.6.22 still seems to win
 hands-down on these tests.
 >
 > However I then launched TamTamMini from sugar, started a drumbeat and
 played a continuous tone on an instrument for a minute or so. Didn't hear
 any imperfections. So perhaps we have reached the stages of being "good
 enough"

 It comes down to what are the use cases we care about in deployed systems.
 Kids will launch TamTamMini directly from Sugar, not from the terminal and
 I'm guessing they won't be multitasking a lot and running multiple
 activities at once and have TamTamMini playing audio in the background
 while doing something else (I could be wrong).

 I'll go ahead and commit the config update for 8.2.

 I did try to run latencytop on the XO today but I think there's a version
 missmatch between
 what's in our kernel and the package in the Fedora repositories so need to
 custom build the old version from scratch and try some more.

-- 
Ticket URL: <http://dev.laptop.org/ticket/7603#comment:48>
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