Today's mesh testing.

[Walter Bender]

Really is good news. Something we can work from.

-walter

On Sun, Mar 2, 2008 at 10:13 PM, John Watlington <wad at laptop.org> wrote:
>
>  Thanks for the info !   This is good news, as it means that schools
>  up to a hundred students should work right now, given a school server
>  and three active antennas...
>
>  wad
>
>
>
>  On Mar 2, 2008, at 7:05 PM, Chris Ball wrote:
>
>  > Hi,
>  >
>  > Daf and I got the school server jabberd/shared roster working today.
>  > We connected/registered 32 laptops to it with mesh TTL set to 1 for
>  > broadcast, and they were all able to see and join a shared chat
>  > session
>  > with each other.  The workload on the spectrum analyzer increased from
>  > 18% (no-one connected) to 26% (all connected).  The chat session is
>  > consistent -- no-one is dropping out and new messages are seen by each
>  > laptop, with a few seconds of lag.
>  >
>  > With the mass chat session still running, we shared a 500KiB PDF.
>  > First
>  > we joined the shared Read session with one laptop, and the download
>  > took
>  > 16 seconds to complete.  We then joined two more laptops at once, the
>  > first download took 26 seconds and the second finished at 30 seconds.
>  > Five more at once: all finished around 1m00s.  Ten more at once:  the
>  > first finished at 2m18s, the last finished at 2m40s.  There were no
>  > failures downloading the PDF.  The sharing was unicast TCP, with mesh
>  > TTL set to 1, which explains the slightly worse than linear
>  > increase in
>  > download time for more laptops downloading at once.
>  >
>  > This is much more anecdotal than the full test plan, but we thought
>  > the
>  > testers currently in Peru would want to know what they can expect from
>  > the school server setup ASAP.  We don't have more laptops upgraded and
>  > ready to join the network yet, but we don't have any reason to believe
>  > we've saturated the network -- with the PDFs downloaded and Chat still
>  > running, the duty cycle on the spectrum analyzer is now at 28%.  (In
>  > general, wireless networks seem to start degrading around 40%.)
>  >
>  > - Chris and Daf.
>  > --
>  > Chris Ball   <cjb at laptop.org>
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-- 
Walter Bender
One Laptop per Child
http://laptop.org