Mesh testing on Monday.

[Chris Ball]

Hi,

Here's a plan for Monday's mesh test.  Feel free to edit it.

   http://wiki.laptop.org/go/Mesh_Testing

Plaintext copy of the current revision enclosed below:

===

This page describes the network testing that will be performed on Monday
Feb 25th at 1cc.

Setup:

    * Start with ten machines, keep adding ten at a time while it is
      useful to do so.

Measurements to make during each test (in addition to workload-specific
measurements):

    * Spectrum utilization -- as measured w/ spectrum analyzer and/or
      from wireshark
          o Wireshark may be able to break down bandwidth by packet type 
    * Remaining bandwidth -- attempt to download a large file on one
      machine during test, record time taken or bandwidth achieved.
    * Total # of laptops seen on mesh view on all numbers (should be n^2). 

Workloads -- tests to perform, along with their quantitative metrics:

   1. Idle load.
   2. Every machine coming out of suspend (or booting).
   3. Every machine trying to register with school server -- Number of
      machines that failed the first attempt, failed second attempt, etc.
   4. Ricardo's web spider at various rates of download (download 1k
      page/second, etc)
   5. Read -- if one laptop shares a PDF, how many laptops fail to
      retrieve it?
   6. Distance -- binary success/fail. Are there other metrics?
   7. Write -- automate pressing N characters a second for small N, look at
      received rate/update time, increase number of participants.
   8. olpc-update -- number of machines upgraded in 1 hour 

Variables to investigate:

    * Set mesh ttl to 1 for every packet
    * Change bcast/mcast rate on every node
    * Jim's Avahi config 30% fixes?
    * Presence: Benchmark bandwidth use of Avahi vs. Cerebro vs. no presence?
    * Collaboration: Benchmark switching from multicast to unicast?
    * Suspend/resume: Off vs. on, wake-on-unicast vs. wake-on-multicast
    * Block multicast in route table (are there other sources of
      multicast packets other than the above?)
    * Are there other mesh parameters to tweak? Path request timeout,
      for example.

- Chris.
-- 
Chris Ball   <cjb at laptop.org>