#12209 LOW 4-firmw: XO-4 B1 8787 repeated HTTP get does not survive long

[Zarro Boogs per Child]

#12209: XO-4 B1 8787 repeated HTTP get does not survive long
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           Reporter:  Quozl                |       Owner:  Quozl               
               Type:  defect               |      Status:  new                 
           Priority:  low                  |   Milestone:  4-firmware          
          Component:  ofw - open firmware  |     Version:  Development firmware
         Resolution:                       |    Keywords:                      
        Next_action:  diagnose             |    Verified:  0                   
Deployment_affected:                       |   Blockedby:                      
           Blocking:                       |  
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Changes (by Quozl):

  * priority:  normal => low


Comment:

 This problem does not seem to show up in the normal use case of net boot,
 net install, or single fetch.  So I'm lowering priority.

 Did a test on Q7B31 of repeating HTTP GET after reboot, passed 4225
 cycles, average 4.5 seconds, all but one sample completed the GET within 6
 seconds.

 Test script:
 {{{
 \ OLPC XO-4 #12209 http after reboot test, version 1.0, 2013-05-22
 visible essid n
 select ip
 cr t( get-file http:\\qz\4\q7b29jg.rom ." time: " )t cr .clock bye
 }}}

 Analysis of serial console log:
 {{{
 % grep -a time: /tmp/s2|sed 's/time: //;s/ us//;s/,/./' > k
 % R
 > k <- read.table("k", header=FALSE)
 > v1 <- k$V1
 > min(v1)
 [1] 4335.668
 > max(v1)
 [1] 20578.23
 > mean(v1)
 [1] 4540.846
 > median(v1)
 [1] 4484.756
 > sqrt(var(v1)) # standard deviation
 [1] 293.517
 > length(v1)
 [1] 4225
 > q()
 }}}

-- 
Ticket URL: <http://dev.laptop.org/ticket/12209#comment:3>
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