#12781 HIGH 13.2.0-: XO-4 Android performance regression on 1GB units

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#12781: XO-4 Android performance regression on 1GB units
--------------------------------+-------------------------------------------
           Reporter:  Quozl     |       Owner:  Quozl                            
               Type:  defect    |      Status:  new                              
           Priority:  high      |   Milestone:  13.2.0-android                   
          Component:  android   |     Version:  Development build as of this date
         Resolution:            |    Keywords:                                   
        Next_action:  diagnose  |    Verified:  0                                
Deployment_affected:            |   Blockedby:                                   
           Blocking:            |  
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Changes (by Quozl):

 * cc: ben at morphoss.com, sasha at morphoss.com, chris at morphoss.com (added)


Comment:

 Coincident with the symptom is serial console output:
 {{{
 [   61.369810] alloc_contig_range test_pages_isolated(23100, 23269) failed
 [   61.455949] alloc_contig_range test_pages_isolated(22600, 22769) failed
 [   61.456288] alloc_contig_range test_pages_isolated(23000, 23169) failed
 }}}

  * [http://dev.laptop.org/~quozl/y/1Wmrb5.txt patch] to show meminfo banks
 and report stack on 20th allocation failure,
  * [http://dev.laptop.org/~quozl/z/1Wmrcx.txt log] of serial console with
 stack trace,

 The allocation that failed was made by the graphics driver, via ION, via
 CMA, into DMA.

-- 
Ticket URL: <http://dev.laptop.org/ticket/12781#comment:1>
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