Deeksha, Look here why we couldn't configure the thresholds...
Arik https://www.millennium.berkeley.edu/pipermail/tinyos-devel/2010-April/004371.html On Tue, Apr 6, 2010 at 22:14, Arik Sapojnik <[email protected]> wrote: > I tried to raise the same questions on this forum several months ago, but > also didn't get a clear answer. > So, relying on this (the lack of negation) and on My results, the results > posted here: > http://sourceforge.net/apps/mediawiki/takatuka/index.php?title=Results > And here: > > http://www.pats.ua.ac.be/content/publications/2009/dvdakker09tinyspotcomm.pdf > > I conclude that this is the minimum achievable delay. > > Arik > > > > On Tue, Apr 6, 2010 at 20:18, Deeksha Rao Sahib <[email protected] > > wrote: > >> Hey Arik, >> >> So can i conclude that this min delay cannot be avoided?? >> > Hi Deeksha, >> > >> > I have investigated the same issue, and tried to reduce the CSMA >> > thresholds; >> > but couldn't achieve less then about 18 mSec (average). >> > Of course it depends on the packet's size. >> > >> > Arik >> > >> > >> > On Tue, Apr 6, 2010 at 15:56, Deeksha Rao Sahib >> > <[email protected]>wrote: >> > >> >> >> >> Hi, >> >> >> >> If the delays are due to backoffs then disabling the CCA should give me >> >> lesser delay rite?? >> >> >> >> But its still the same.. >> >> >> >> Printing local times at CC2420 Transmit and Receive programs what i >> >> found >> >> out is that at the sender there is a min delay of 9ms between call >> >> AMSend.send command and the SendDone event. >> >> >> >> Also at the receiver side there is a delay of 13ms by the time receive >> >> event is triggered in the application when compared with the >> timestamp.. >> >> >> >> Can these delays be trusted or is there any mistake in this analysis?? >> >> >> >> > >> >> >> On Wed, Mar 31, 2010 at 1:40 AM, Deeksha Rao Sahib >> >> >> <[email protected]> wrote: >> >> >>> >> >> >>> Hi all, >> >> >>> >> >> >>> I am using FTSP in my code for time sync and I've been trying to >> >> >>> measure >> >> >>> the hop delay for different links in the network. From the initial >> >> >>> tests >> >> >>> using global time and the timestamps i figure out that the per hop >> >> >>> delay >> >> >>> is about 20 ms. >> >> >>> >> >> >>> My applications requires that this delay be minimized. How can this >> >> be >> >> >>> done?? >> >> >>> Any inputs would help... >> >> >> >> >> >> Some of that delay is due to MAC backoffs etc. before the packets >> are >> >> >> sent. You can reduce them but that can invite suboptimal MAC >> >> >> performance. >> >> >> >> >> >> - om_p >> >> >> >> >> >> -- >> >> >> This message has been scanned for viruses and >> >> >> dangerous content by MailScanner, and is >> >> >> believed to be clean. >> >> >> >> >> > >> >> > >> >> > --Deeksha >> >> > >> >> >> >> >> >> --Deeksha >> >> >> >> -- >> >> This message has been scanned for viruses and >> >> dangerous content by MailScanner, and is >> >> believed to be clean. >> >> >> >> _______________________________________________ >> >> Tinyos-help mailing list >> >> [email protected] >> >> >> https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help >> >> >> > >> > >> > >> > -- >> > Best Regards, >> > Arik Sapojnik >> > >> > -- >> > This message has been scanned for viruses and >> > dangerous content by MailScanner, and is >> > believed to be clean. >> > >> > >> >> >> --Deeksha >> >> -- >> This message has been scanned for viruses and >> dangerous content by MailScanner, and is >> believed to be clean. >> >> >
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