[xcp] Questions about delta_throughput and reaction to packet loss
faber at ISI.EDU
Tue Nov 22 18:40:08 PST 2005
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
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
Let me know if that makes sense.
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