The FIRST feedback packet should not report a particularly low rate since it
is not over very much time.
The first feedback packet AFTER AN IDLE PERIOD is taken care of by the Receive
Rate Adjustment algorithm, I would think.
Eddie
Arjuna Sathiaseelan wrote:
Let me be more clear: the first feedback packet after an idle period.
I guess we ignore it?
-Arjuna
On 9/24/06, Arjuna Sathiaseelan <arjuna.sathiaseelan@xxxxxxxxx> wrote:
Dear Eddie,
Thanks for your reply. No, the first feedback is sent with a very
low receiver rate. Do we ignore that feedback packet?
-Arjuna
On 9/24/06, Eddie Kohler <kohler@xxxxxxxxxxx> wrote:
> Hi Arjuna
>
> Clarifying question. Do you mean that the first feedback packet is
sent
> containing no estimate of receiver rate? Because it's sent in
response to
> only one packet?
>
> Eddie
>
>
> Arjuna Sathiaseelan wrote:
> > Dear All,
> >
> > I am in the process of updating the DCCP CCID3 ns-2 code, and would
> > like to know what do we do with the FIRST feedback packet. Do we
> > ignore it or do we increase the sending rate X by 2*X without
> > considering the receiver rate X_recv? Increasing it by 2*X seems to
> > give an aggressive behaviour.
> >
> > "If (sender has been idle or data-limited)
> > min_rate = max(2*X_recv, W_init/R);
> > Else
> > min_rate = 2*X_recv;
> > If (p > 0)
> > Calculate X_calc using the TCP throughput equation.
> > X = max(min(X_calc, min_rate), s/t_mbi);
> > Else if (not the first feedback packet, and
> > not the first feedback packet after a nofeedback timer)
> > If (t_now - tld >= R)
> > X = max(min(2*X, min_rate), s/R);
> > tld = t_now;"
> >
> >
> >
> >
>
--
Dr.Arjuna Sathiaseelan
Electronics Research Group
University of Aberdeen
Aberdeen AB24 3UE
Web: www.erg.abdn.ac.uk/users/arjuna
Phone : +44-1224-272780
Fax : +44-1224-272497
