#9325 NORM 1.5-sof: full-screen fills are slow in X

[Zarro Boogs per Child]

#9325: full-screen fills are slow in X
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           Reporter:  cjb              |       Owner:  cjb               
               Type:  defect           |      Status:  new               
           Priority:  normal           |   Milestone:  1.5-software-later
          Component:  x window system  |     Version:  not specified     
         Resolution:                   |    Keywords:                    
        Next_action:  test in build    |    Verified:  0                 
Deployment_affected:                   |   Blockedby:                    
           Blocking:                   |  
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Comment(by mikus):

 Some more data points, running 'python test.py' :
 {{{
 Serial       ROM     Build  #flips/sec
 CSN74900FB3  Q2E42e  802B5      72
 CSN74903BE3  Q2E42e  110-py     74
 SHC834024E2  Q2E42e  os13       76    (2010/03/22 kernel)
 SHC9370111D  Q3A35   os116      62
 }}}
 What I noted on all the F11 XO-1 machines was that the first time I ran
 'python test.py', the flips/sec were in the low 60s.  On subsequent runs
 they were normally in the 70s.  I am guessing that the XO-1 video hardware
 is capable of at least the mid-70s, but that it could be the software
 implementation that is the bottleneck.  Perhaps the first run filled some
 sort of a "working cache', which then did not need to be refilled by the
 subsequent runs.

 This might explain the somewhat slower performance on the XO-1.5 -- there
 the flips/sec started around 60, and never improved.  Perhaps the XO-1.5
 systems were not able to employ any such "working cache" implementation.

-- 
Ticket URL: <http://dev.laptop.org/ticket/9325#comment:12>
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