#4805 BLOC Update.: OLPC laptops interfering with other 802.11b/g traffic

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#4805: OLPC laptops interfering with other 802.11b/g traffic
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  Reporter:  kimquirk  |       Owner:  mbletsas
      Type:  defect    |      Status:  new     
  Priority:  blocker   |   Milestone:  Update.1
 Component:  wireless  |     Version:          
Resolution:            |    Keywords:          
  Verified:  0         |  
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Comment(by carrano):

 Replying to [comment:17 AlbertCahalan]:
 > Note that the beacons.png graph is showing bytes, not transmit time.
 >
 > If the mesh is at 1 megabit/second while regular laptops are at 11 or
 54, then you really need to multiply the mesh traffic by 11 or 54 to
 account for that.
 >
 > Low-speed traffic can be even worse. Under some conditions (forgot the
 details, sorry) it can make other stuff go at the slow rate as well.
 >

 Albert,
 Yes, this is not an airtime graph. But, that's why I added the green line
 - an indicator that the beacons generated by other sources are more
 demanding, even tough the XOs outnumber them by far. Also note that these
 other beacons are also transmitted at 1Mbps. So we have more traffic
 generated by the beacons of the APs, than those of the XOs (and we
 probably have 50 XOs here).
 My point is: we cannot simply multiply the traffic generated by the
 beacons of one XO per the number of XOs - because they back off when they
 hear another XO's beacons.
 And, more important, the data frames are not being transmitted at 1Mbps,
 only the beacons (and this is exactly what other 802.11 nodes do).

-- 
Ticket URL: <http://dev.laptop.org/ticket/4805#comment:18>
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