Dear Dr. Gnawali,
Sorry to get back to you so late, we had a paper deadline.
Everything works fine if I set LPL variables from the Makefile as in
TestNetworkLpl. Problems arise only on trying to set LPL variables from
the program using "setLocalWakeupInterval()". Just to verify in the later
case, I retrived sleep interval value using "getLocalWakeupInterval()",
the returned value is consistent with what I set it to.
Manjunath D
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On Fri, 22 Oct 2010, Omprakash Gnawali wrote:
Are you using TestNetworkLpl and changing the flags in the Makefile to
control various intervals? If not, you should tell me how to replicate
your problem starting with TestNetworkLpl.
- om_p
On Thu, Oct 21, 2010 at 11:01 PM, Manjunath Doddavenkatappa
<dodda...@comp.nus.edu.sg> wrote:
Generally, yes. As ETX increases lossses also increase. I can observe the
fact that RetxmitTimer in CtpForwardingEngine being fired quite a few times
before sucessfully transmitting every packet.
But, only a few times this does not hold with packets getting through
although ETX remains at a higher value.
Please let me know if you want me to redo the experiments if you need any
other information.
Regards,
Manjunath D
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On Thu, 21 Oct 2010, Omprakash Gnawali wrote:
On Tue, Oct 19, 2010 at 1:04 AM, Manjunath Doddavenkatappa
<dodda...@comp.nus.edu.sg> wrote:
Dear All,
We are not able to figure out a reason why ETX values in CTP increases
as
wake-up interval of the LPL (BoXMaC-One) increases. We have a simple
setup
of a sender and a root node placed adjacent to each other. Nodes use
maximum power of 0 dBm.
1) We are using IPI of 15s. We repeated the experiment at three
different places with sevral runs runs at every location. Different
wake-up intervals were tried back-to-back so that temporal variations are
minimized. We used wake-up intervals of 10, 20, 40, 100, and 1000 (ms).
2) We also used "LPL.setRemoteWakeupInterval(&packet, WAKEUP_INTERVAL +
100)" but without any luck.
3) Our debug messages show that CTP's RetxmitTimer being fired quite a
few times before sucessfully transmitting every packet.
4) I first thought that the loss of data packets in the BoXMAC's
preamble could be the reason, but looking into the LPL code, I understand
that preamble packet losses are not fed into the Link Estimator.
5) In some experimental runs, particularly when the wake-up interval
is 1000ms, no packet go-through. Requires a hard reboot.
6) Searching the archieves for "CTP and LPL on tmote", I found that
similar problem being discussed sometime in Dec 2008. The discussion
suggests quite a few number of changes.
http://mail.millennium.berkeley.edu/pipermail/tinyos-devel/2008-December/003510.html
We should debug this. Do you also observe loss in delivery ratio along
with high ETX values?
- om_p
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