[xcp] Questions about delta_throughput and reaction to packet loss

[Ted Faber]

On Mon, Nov 21, 2005 at 10:08:29AM -0800, Leon Martin wrote:
> Hi all,
> 
> XCP is new to me. So my question may be a bit simple.
> Can someone help me with the following doubts:
> 
> 1. In the original 2002 paper, the feedback is in
> terms of bytes, but in the 2005 draft and the 2.29
> ns-2 implementation, the feedback is in bits/sec
> (i.e., delta_throughput). Is there any reason for this
> change?

It's also changed in Dina's thesis.

In the SIGCOMM paper the protocol passes around explicit cwnd values -
which are in bytes.  Later versions of the protocol manipulate the
throughputs directly so not to be tied to a specific rate control
algorithm, e.g., sliding windows.

There's a different trick involving changing units to eliminate the
divisions at the routers that we should write up for your collective
amusement.

Let me know if that makes sense.

-- 
Ted Faber
http://www.isi.edu/~faber           PGP: http://www.isi.edu/~faber/pubkeys.asc
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