#10180 NORM 1.5-sof: Journal hangs every five or six entry erasures

[Zarro Boogs per Child]

#10180: Journal hangs every five or six entry erasures
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           Reporter:  Quozl             |       Owner:  tomeu                            
               Type:  defect            |      Status:  new                              
           Priority:  normal            |   Milestone:  1.5-software-later               
          Component:  journal-activity  |     Version:  Development build as of this date
         Resolution:                    |    Keywords:                                   
        Next_action:  diagnose          |    Verified:  0                                
Deployment_affected:                    |   Blockedby:                                   
           Blocking:                    |  
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Comment(by Quozl):

 Tested same version of Sugar on XO-1, using the reproducer above, no sign
 of stall in DS process.

 DS was written against the no-stall behaviour of the XO-1 kernel and the
 XO-1.5 kernel is generating a different behaviour.

 Tested same kernel version on XO-1.  Write rate to internal NAND flash was
 7,566,575 bytes per second.

 Made same test on XO-1.5  Write rate to internal microSD was 1,533,005
 bytes per second.

 {{{
 dd if=/dev/zero of=here bs=1024k count=100;sync
 }}}

 It seems the DS test configuration was not representative for the XO-1.5,
 and the XO-1.5 sequential write performance is lower than the XO-1 by a
 factor of five.

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Ticket URL: <http://dev.laptop.org/ticket/10180#comment:4>
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