[R-C] Fairness of RRTCC and TCP

[Mo Zanaty (mzanaty)]

Hi Varun,

Do the TCP flows not start until ~60s after the RRTCC flows start? Or does RRTCC completely starve out all TCP flows until it fully saturates the entire link bandwidth? The latter appears to be the case in the last 2 slides (2xRRTCC+10xTCP), since there is a brief blip of TCP before 60s. Does this mean the queue (50 packets) filled very early at startup and sent all the TCPs from slow start to congestion avoidance while RRTCC continued exponential increase?

Thanks,
Mo

-----Original Message-----
From: rtp-congestion-bounces at alvestrand.no [mailto:rtp-congestion-bounces at alvestrand.no] On Behalf Of Varun Singh
Sent: Thursday, August 02, 2012 11:48 AM
To: rtp-congestion at alvestrand.no
Subject: [R-C] Fairness of RRTCC and TCP

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 at alvestrand.no
http://www.alvestrand.no/mailman/listinfo/rtp-congestion