Re: Error Model

[Nitin H Vaidya <vaidya@cs.tamu.edu>]

Parag:

Like I said, the ErrorModel behavior was unpredictable. It
has been working fine lately, but what you pointed out
is, in fact, a bug.

  >> From saadb@cs.tamu.edu Wed Jul  1 08:32:20 1998
  >> Hi!
  >> 
  >> 	I pointed out this bug a few months ago. What is your ns
  >> version ?.

The bug appears in the version (from Jan'98) we are using.
We apparently forgot to re-check for that bug (Saad works with
me) ... lack of long-term memory -:)

- nitin



  >> 	Indeed, the bind is not done properly for the variable errPkt_.
  >> Therefore, it happens that errPkt_ is not initialized properly resulting
  >> in the following behavior : the first loss may not occur if errPkt_ took
  >> accidently a large number at the beginning. Since, it is not initialized,
  >> the value you start with is just random.
  >> 
  >> 				Saad.
  >> 
  >> On Wed, 1 Jul 1998, Parag at CMU wrote:
  >> 
  >> > Nitin, 
  >> > 
  >> > I was checking the errmodel.cc files when i came across this piece of code:
  >> > 
  >> >         bind("rate_", &rate_);
  >> > !!!     bind("errPkt_", &errByte_); !!!
  >> >         bind("errByte_", &errByte_);
  >> >         bind("errTime_", &errTime_);
  >> >         bind("onlink_", &onlink_);
  >> > !!!     bind("enable_", &onlink_); !!!
  >> >         bind("off_mac_", &off_mac_);
  >> > 
  >> > I wonder if the 2nd and the 2nd to last lines are really what they are
  >> > supposed
  >> > to be?
  >> > Let me know if you fixed the bug and if this was the cause.
  >> > 
  >> > I am also interested in passing a few new variables from my tcl scripts to
  >> > the 
  >> > errmodel.cc file.... what is the right way to do it? 
  >> > Will just binding as illustrated above do it? 
  >> > What are the other places to make changes if any?
  >> > 
  >> > thanks,
  >> > -Parag
  >> > 
  >> > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 
  >> > Parag Manihar
  >> > Master of Science in Information Networking (MSIN),
  >> > Carnegie Mellon University (CMU) .
  >> > 
  >> > 
  >> > 
  >> 
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