On Mon, Aug 28, 2006 at 08:17:49AM +0200, Edgar E. Iglesias wrote:
> On Sun, Aug 27, 2006 at 04:33:15PM +1200, Ian McDonald wrote:
> > Burak wrote on the Linux DCCP mailing list:
> > >> After applying Ian's patches (except for bestpacketnext) I did some
> > >tests with ccid3 and came across a problem. In some cases when packet loss
> > >occurs, transmit rate drops down and stays there, with almost no increase.
> > >Besides, p value is set to a value bigger than zero after the loss, and
> > >does not change again, although no loss occurs - which may be the
> > >explanation of the unchanging tx rate ???
> > >
> >
> > I have a question for people. If DCCP detects loss once and once only
> > (as I suspect is happening here (Burak - can you confirm through a
> > packet trace please?) then I haven't read anything in the spec of TFRC
> > or CCID3 which says that you can lower the loss rate later on when you
> > don't have a loss. As I read the spec you only recalculate the loss
> > rate when you get a loss and thus if you have a loss when you are
> > starting you have a real issue.
>
> Hi Ian,
>
> I beleive you need to recompute the loss rate on every received data packet.
> While there is no packet loss, the average loss interval will increase and
> p will decrease.
Some second thoughts :)
Maybe you can get away with recomputing p only when the time allows us to
send a new feedback packet.
Best regards
--
Programmer
Edgar E. Iglesias <edgar.iglesias@xxxxxxxx> 46.46.272.1946
