[Trac #1446] Merge SD speedup patch

[Zarro Boogs per Child]

#1446: Merge SD speedup patch
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 Reporter:  cjb          |       Owner:  dilinger 
     Type:  enhancement  |      Status:  new      
 Priority:  normal       |   Milestone:  Untriaged
Component:  kernel       |     Version:           
 Keywords:  performance  |  
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 I think Pierre offered us a patch to make SD several times faster
 recently.  We should test and merge it.

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Ticket URL: <http://dev.laptop.org/ticket/1446>
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