Re: [ns] Problem - Throughput greater than link bandwith

[Giuseppe Tringali <gtringali@katamail.com>]

At 23.23 03/09/2001 +0200, you wrote:
>Hi NS users,
>
>I have modified the script sat_repeater.tcl that comes with NS.

.....

>Now I try to explain my problem with an example:
>
>ns script_name.tcl 0 2
>
>so the error rate is 0.0 and I have 2 TCP agents and so on ... and a 
>bandwith of 2 Mb/s (or at least I think) .
>
>The awk script gives me a value of about 3.5 (Mb/s I think). How is it 
>possible?

........

My little observation:

(some lines taken from the script and continuing the example)

set NN [lindex $argv 1] --> so in $NN there's the value 2
set bw [expr $NN*1e6] --> so in $bw there's the value 2 000 000
....
set opt(bw_up)          bw; # Uplink bandwidth-- becomes downlink bw also 
---> so the bandwith would be 2 Mb/s

but it is not so because I have tried in the same script the following line:

set opt(bw_up)          2 Mb;

and now the awk script gives me a value < 2 Mb/s

So in the first case, what is the actual value of bandwith?

Thanks in advance,

Giuseppe Tringali