[Testing] Connectivity Test Discussion, Minutes from 6/6/07

[Kim Quirk]

Minutes (also posted on internal wiki, 'Rollout and Deployment')


June 6, 2007

Attending: Michail, Kim, Jim, Walter, Dan (rh), Miguel, Chris (rh), Cameron
(rh), Zack (rh), Rajab (mv), Ronak (mv), Raja (mv)

   - Michail went through his low level 802.11s test plan:

               <http://wiki.laptop.org/go/802.11s_Connectivity_Test_Plan>

   - Path Discovery
      - Used ping, ran tests over several hours, introduced new nodes
      - Found some lost pings in a noisy RF environment; no loss in
      anachoic chamber
      - Network randomly creates mesh paths if you don't force the
      paths
   - Communications Integrity
      - Frame size (large frames) caused problems, so you need to use
      scp to ensure large frames
   - Performance testing
      - Used Iperf
      - To establish a baseline need to use UDP between 2 nodes using
      'infrastructure mode'
      - Found that XO performance does not go down as quickly as 1/n
      due to efficiencies in node-to-node connections
      - Very difficult to make a repeatable non-forced mesh topology
      - Need to set up tests to look for starvation or memory issues
      (over time)


   - Walter suggested some usage cases:
      - 60 laptops, everyone talking to everyone
      - 60 laptops, everyone talking to a server
      - 15 groups of 4, or 4 groups of 15 (representing kids
      collaborating in smaller groups)
         - Groups defined geographically (clusters)
         - Non-cluster Groups (with remote participants)
      - Consider classroom topologies:
         - Rows of students
         - Circle of students
         - Clusters


   - Tests to be added:
      - Multicast and broadcast
         - Non realtime
         - Realtime
      - Dynamic nature of the real world
         - Nodes coming and going
         - Reconfiguration of the network



   - Action items:
      - Marvell India team has 20 laptops; Kim help them to get 40
      more B2-2
      - India is building up knowledge and an automated test bed
      - Marvell with add their test plan to the wiki
      - Cozybit will provide programmable anycast address


   - Items for Trial-2 schedule:
      -
         - Operating while suspended
         - Mesh beacons
         - Programmable anycast
         - Ascii entry for WEP keys
         - Finish support for WiFi compatibility (WPA)


*IPv6 discussion*

The applications driving IPv6 are:

   - management of remote XOs
   - allowing XOs to find other XOs around the world.

Need to understand what this requires for XO and for Server and implement.

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