[Tinyos-devel] Testing FTSP

[Omprakash Gnawali]

On Mon, Jul 28, 2008 at 11:23 PM, Branislav Kusy <kusy at stanford.edu> wrote:
>
>
> Omprakash Gnawali wrote:
>>
>> I wanted to see if the current version of FTSP in rc3 works well in a
>> multihop environment. I modified TestFtsp to send the return value of
>> call GlobalTime.local2Global(&rxTimestamp) through UART every 4s and
>> plotted the output - time on x-axis and node id on y-axis and (x,y) is
>> plotted if the return value is 1 suggesting FTSP is out of sync. If
>> FTSP is working well, we expect very few points on this graph. The
>> experiment was done on channel 25 on a 56-node TelosB testbed.
>>
>> Here are the results:
>> Default tx power: http://enl.usc.edu/~om_p/net2/test-ftsp/ftsp_result1.gif
>> tx power = 14: http://enl.usc.edu/~om_p/net2/test-ftsp/ftsp_result2.gif
>>
>> Is FTSP out of sync too often or not too far off the expected result?
>
> could i see the full log? (even better, if you could log the whole
> test_ftsp_msg_t struct over uart)

The logs from current experiment do not contain information other than
what is displayed on the graph.

> one reason can be (depending on how many hops you have) too high resync
> frequency, currently set to 3 seconds (TIMESYNC_RATE in TestFtsp/Makefile).
> we used ~30 sec for large scale tests.

I forgot to mention that I commented that line from Makefile so it is
using the default of 10s.

- om_p