Subject: [manet] Packet dropping problem

From: "Jack Wang" <[email-masked]>
Date: Sat, 15 May 2004 20:29:25 -0400 (EDT)

Hi,

I am simulating routing protocol for Ad Hoc network with 200 nodes. I find that about 30 percent of the data packet is dropped in IFQ.
Below are some lines from the trace file:
D 82.416615074 _106_ IFQ  --- 279 cbr 532 [13a bd 6a 800] ------- [53:1 55:0 27 189] [2] 3 6
D 82.416615074 _106_ IFQ  --- 314 cbr 532 [13a bd 6a 800] ------- [53:1 55:0 27 189] [4] 3 6
D 82.416615074 _106_ IFQ  --- 342 cbr 532 [13a bd 6a 800] ------- [53:1 55:0 26 189] [6] 4 5
D 83.309369563 _108_ IFQ  --- 324 cbr 532 [13a 7a 6c 800] ------- [53:1 55:0 20 122] [5] 10 5
D 114.010025000 _65_ IFQ  --- 779 cbr 532 [0 b8 41 800] ------- [65:0 66:0 30 184] [39] 0 5
D 114.010025000 _65_ IFQ  --- 322 cbr 532 [13a b8 41 800] ------- [62:2 64:0 24 184] [18] 6 4
D 114.010025000 _65_ IFQ  --- 802 cbr 532 [0 b8 41 800] ------- [65:0 66:0 30 184] [40] 0 5
D 114.010025000 _78_ IFQ  --- 197 cbr 532 [13a 7d 4e 800] ------- [6:1 7:0 26 125] [9] 4 3
D 114.010025000 _78_ IFQ  --- 216 cbr 532 [13a 7d 4e 800] ------- [6:1 7:0 26 125] [10] 4 3
D 114.010025000 _78_ IFQ  --- 223 cbr 532 [13a 7d 4e 800] ------- [6:1 7:0 26 125] [11] 4 3
 
What cause the data packet dropping? The length of the queue is 800. I am using Queue/DropTail/PriQueue. Is the queue too short?

Thanks a lot.

Jack

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