Re: [ns] big delay by MAC-802_11 bug

2009-04-08 Thread David Ross

Anas, the delay is not the MAC, it is the RTR to the MAC, which is the 
IFQ.  The only time I see these delays is with lots of nodes and lots of 
queued packets, say 50 queued and each takes 3 seconds to win contention 
= 150 seconds for the packet to get out.

- David Ross
QUT, Australia. (UTC+10hours)

anas wrote:
 Dear all,

 I have encountered a large delay end to end delay
 and when I checked the out put file I see some of the packets have a very 
 large delay at MAC layer as shown below:

 f 202.663960039 _25_ RTR  --- 585 cbr 576 [13a 2b 19 800] --- [9:1 10:1 
 25 30] [17] 7 2
 s 358.840523771 _25_ MAC  --- 585 cbr 634 [13a 1e 19 800] --- [9:1 10:1 
 25 30] [17] 7 2
 as it appears there is about 150 second at MAC layer

 what is the bug here
 I used NS2.33 under both Linux and sygwin all of them have the same bug

 please help me
 best regards
 Anas 
   



[ns] big delay by MAC-802_11 bug

2009-04-06 Thread anas

Dear all,

I have encountered a large delay end to end delay
and when I checked the out put file I see some of the packets have a very 
large delay at MAC layer as shown below:

f 202.663960039 _25_ RTR  --- 585 cbr 576 [13a 2b 19 800] --- [9:1 10:1 
25 30] [17] 7 2
s 358.840523771 _25_ MAC  --- 585 cbr 634 [13a 1e 19 800] --- [9:1 10:1 
25 30] [17] 7 2
as it appears there is about 150 second at MAC layer

what is the bug here
I used NS2.33 under both Linux and sygwin all of them have the same bug

please help me
best regards
Anas