[Planetlab-users] probing for bandwidth measurements

[Gaurav Gupta]

Manish,

> Figure <http://www.cc.gatech.edu/~jain/send_disp.eps> shows actual 
spacing
> (dispersion) between packets at sender, when desired spacing was 120 
usec.
> Note that the packets in train almost periodically have large spacing,
> about 10 msec, which may due to context switching. The requested rate 
and
> actual rate for this packet train are 60Mbps and 6.6Mbps, respectively.

The sending rate is 6.6Mbps averaged over whole of train, but majority
pair of packets are going at the rate of 60Mbps(80%), if we measure
the inter packet arrival time between each pair of packets, i believe
that there will be clearly two sets of value with a large gap between
them(two sets sending time gap) and filter/smooth en the arrival gap,
we could get an accurate arrival rate( what do u say ?)

Gaurav

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