[ns] problem with trace file when using CBQ

[Manoj Agarwal <magarwal@cs.utexas.edu>]

i Haobo,
thanks for the earlier response, but here is a strange problem.
when I'm using CBQ instead of DropTail in my network topology, and I'm
monitering a particular queue using trace-queue, it has multiple entries
for the same
packet(15 entries), first of all I don't understand why I'm having
multiple entries for the same packet, second some entries are having time
stamp which are even less then the propogation delay to reach that queue,
then how come that entry for that particular packet got recorded in the
trace file, also If this problem is going to be around, shall I use the
last entry as my final time stamp to compute delay??
one more thing, I'm here having entries with "=" in the first column,
there are no entries like "-" or "r", while if I use DropTail, this
trace-queue command works perfectly fine.
any pointer in this direction is highly appreciated
-Manoj


On Tue, 21 Nov 2000, Haobo Yu wrote:

> you should read related document regarding trace file format, e.g., the
> source code.
> 
> On Tue, 21 Nov 2000, Manoj Agarwal wrote:
> 
> > Hi Haobo,
> > thanx a lot for your earlier response.
> > But here is one more small problem with trace file.
> > 
> > I want to generate traffic from a trace file.
> > So I wrote in my program:
> > 
> > set tracefile [new Tracefile]
> > $tracefile filename Data.tr
> > set traffic [new Application/Traffic/Trace]
> > $traffic attach-tracefile $tracefile
> > 
> > But when I run my program it says :
> > bad file size in Data.tr
> > 
> > Data.tr contains :
> > 10000 53
> > 20000 53
> > ...
> > 
> > I have already converted these 2 values to 32 bit unsigned integers but
> > still it gives the same error.
> > What have I to do?
> > 
> > any pointer in this direction is highly appreciated.
> > TIA
> > -Manoj
> > 
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> > 
> 
>