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
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