Hi Arjuna, See inline... Tom P. > -----Original Message----- > From: Arjuna Sathiaseelan [mailto:arjuna.sathiaseelan@xxxxxxxxx] > Sent: Thursday, April 20, 2006 10:53 AM > To: Jeroen Van Velthoven > Cc: dccp@xxxxxxxx > Subject: Re: TFRC average loss interval calculation > > Ok I went through the audio archive - and Tom Phelan points out the [Tom] I think it's pretty unlikely that I said that -- I'm as confused as the rest of you with regard to this. But I do remember that someone else said this, maybe someone speaking for Eddie's input from jabber. > same problem - that some implementations average the loss intervals > over 8 samples even though there are less than 8..So I guess - the > correct thing would be to average them based on the no of samples > currently available..So the ns-2 code needs to reflect the change..My > few cents - do correct me if I am wrong :) > > -A > > On 4/20/06, Arjuna Sathiaseelan <arjuna.sathiaseelan@xxxxxxxxx> wrote: > > Dear Jeroen, > > I concur with your views - I guess this question was raised in the > > recent IETF > > meeting. Maybe someone can shed proper light on this :). > > > > Regds, > > Arjuna > > > > On 4/20/06, Jeroen Van Velthoven <jeroen.vanvelthoven@xxxxxxxx> wrote: > > > Dear all, > > > > > > I am performing some experiments with DCCP/TFRC. Therefore, I'm using > the > > > DCCP implementation of Mattsson. My question relates to the > calculation of > > > the average loss interval as it is done by this implementation. As > > > specified the TFRC RFC, the 8 most recent loss intervals are used to > obtain > > > the average loss interval. However, also when the first loss event > occurs > > > and in every situation where the number of initialized loss intervals > is > > > strictly smaller than 8, this implementation takes the sum W_{tot} of > all 8 > > > weights and uses this result to determine the average loss interval. > > > > > > I would assume that when the loss history contains only two loss > intervals, > > > it is sufficient to take only these weights into account when > calculating > > > W_{tot}. This would not result in an overestimate of the loss event > rate > > > you get by taking into account the total of the 8 weights. > > > > > > Can anyone confirm that the number of weights you need to use to > obtain the > > > average loss interval equals the minimum of 8 and the number of the > actually > > > created loss intervals? > > > > > > Best Regards, > > > Jeroen > > > > > > ------------------------------------------------------------------- > > > Jeroen Van Velthoven > > > > > > Phone: +32 (0)3 265.38.53 > > > Fax: +32 (0)3 265.37.77 > > > Email: Jeroen.VanVelthoven@xxxxxxxx > > > > > > University of Antwerp (UA) > > > Dept. Mathematics and Computer Science > > > PATS Research Group > > > Campus Middelheim, building G > > > Middelheimlaan 1 > > > B-2020 Antwerp > > > Belgium > > > ------------------------------------------------------------------- > > > > > > > > > > > > > > > > > > > > > -- > > Regards, > > Arjuna > > > > Postdoctoral Researcher > > Engineering Research Lab, > > Department of Engineering, > > University of Aberdeen > > > > > -- > Regards, > Arjuna > > Postdoctoral Researcher > Engineering Research Lab, > Department of Engineering, > University of Aberdeen
