[Trac #1435] Show page Fault/Can't open boot device/Boot load failed in OFW.

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#1435: Show page Fault/Can't open boot device/Boot load failed in OFW.
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  Reporter:  chiaying.lin  |       Owner:  wmb at firmworks.com
      Type:  defect        |      Status:  assigned         
  Priority:  normal        |   Milestone:  BTest-4          
 Component:  hardware      |     Version:                   
Resolution:                |    Keywords:                   
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Comment (by wmb at firmworks.com):

 What is causing the JFFS2 to use so much memory?

 As one hot spot, the image I analyzed had 31 copies (probably one current
 copy and 30 obsoleted ones) of a file named LARGE.FIL .  That file used
 66560 data nodes for each copy, so there were over 2 million data nodes
 just for copies of that file.

 Each data node currently occupies 16 bytes in the in-memory map of the
 JFFS2 filesystem, so that file alone accounts for 33 MB of RAM usage.

 There is also SMALL.FIL and MEDIUM.FIL, 31 copies each, totaling 25 MB of
 RAM usage.

 So those three files account for 58 MB of the 86 MB used for data node
 storage.  (There is an additional 24 MB used by directory entries).

-- 
Ticket URL: <http://dev.laptop.org/ticket/1435#comment:13>
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