#10058 NORM 1.5-sof: Wake-on-LAN does not work during downloads

[Zarro Boogs per Child]

#10058: Wake-on-LAN does not work during downloads
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           Reporter:  martin.langhoff  |       Owner:                     
               Type:  defect           |      Status:  new                
           Priority:  normal           |   Milestone:  1.5-software-update
          Component:  not assigned     |     Version:  not specified      
         Resolution:                   |    Keywords:                     
        Next_action:  never set        |    Verified:  0                  
Deployment_affected:                   |   Blockedby:                     
           Blocking:                   |  
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Comment(by Quozl):

 Tested on os116, the same symptom occurs, but less often.  The arriving
 packets usually wake the laptop.  But not always.

 Dramatically lowering the data rate (by using /dev/random instead of
 /dev/zero as the input) reduces the frequency of the symptom, but it still
 occurs occasionally.  What seems to trigger it then is the arrival of a
 packet at about the same time the idle suspend begins.

 Using ssh to desktop and then running top(1) with varying delay values
 gave inconsistent results, as if idle suspend was defeated at high update
 rates:

 ||''delay''||''result''||
 ||0.01||no suspend attempted||
 ||0.1||no suspend attempted||
 ||0.2||suspend followed by wake, some of the time||
 ||1.0||suspend followed by wake, most of the time||
 ||10.0||suspend followed by wake, almost all the time||

 Both laptops used in the test were C1 with os116, and could easily be
 woken with ping or by having data on a connection arrive after the idle
 suspend has begun, for example:

 {{{
 ssh desktop "sleep 30; df"
 }}}

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Ticket URL: <http://dev.laptop.org/ticket/10058#comment:4>
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