Hi Piers, comments inline. On Thu, Aug 2, 2012 at 9:14 PM, Piers O'Hanlon <p.ohanlon@gmail.com> wrote:
Hi Varun,
This looks interesting - it would be nice to see self-fairness performance as well. What model did you use for the
The second set of experiments 2 RTP and TCP, which is not exactly evaluating for self fairness but the last two graphs show the two RTP flows stacked on top of one another.
codec in ns2 (EvalVid or mpeg_traffic or other) ?
I dont use either but, I'd have to use EvalVid_RA for this because AFAIK EvalVid does only fixed rate. On the other hand, we have an implementation which connects ns2 to a real codec over IPC, but the simulations take a lot of time and therefore preferred to do just packet simulations in the first iteration. In these simulations, I simplify and use equal sized frames instead of a group of pictures (I would have to run more simulations to vary GoP and measure its impact and didn't want to pick a wrong GoP for these preliminary results).
I (and probably others) would be interested to have access to the ns2 RRTCC implementation - would it possible to release the source code? (Though I'd be surprised if Google haven't already implemented it in ns2/3 already as well ...)
The code is currently still work in progress as I am also experimenting with other types of congestion indicators/algorithms (and would need some more time for cleanup) but, I have been using http://code.google.com/p/webrtc/source/browse/#svn%2Ftrunk%2Fsrc%2Fmodules%2... as a guideline for the implementation. Regards, Varun
Thanks,
Piers
On 2 Aug 2012, at 08:47, Varun Singh wrote:
Hi,
Following up on the discussion of fairness between interactive real-time flows and TCP. I've implemented the RRTCC in NS-2 and attached within are the preliminary results.
The scenarios that we simulated are: 1. RRTCC flow shares a bottleneck with short TCP. 2. two RRTCC flows share a bottleneck with with short TCP flows.
The short TCP flows are modelled as on/off flows. The size of the data is obtained from a uniform distribution between 100KB and 1.5MB, and the idle periods are obtained from an exponential distribution with the mean as 10.
The results are available as a short presentation at: http://bit.ly/rrtcc-tcp
I would appreciate any comments and/or feedback.
Cheers, Varun _______________________________________________ Rtp-congestion mailing list Rtp-congestion@alvestrand.no http://www.alvestrand.no/mailman/listinfo/rtp-congestion