what-when-how
In Depth Tutorials and Information
Table 6.3
Top10ISPs(BTVideoUser)
AS#
Peers
AS Name-Internet Service Provider
1
3352
165469
TELEFONICA-DATA-ESPANA(TDE)
2
3662
129047
DNEO-OSP7-COMCAST CABLE
3
6461
127297
MFNX MFN-METROMEIDA FIBER
4
2119
113597
TELENOR-NEXTEL T.NET
5
19262
101390
VZGNI-TRANSIT-Verizon ISP
6
3301
97658
TELIANET-SWEDEN TELIANET
7
3462
96564
HINET-DATA CBG
8
4134
87392
CHINANET-BACKBONE
9
6327
86964
SHAW-SHAW COMMUNICATION
10
174
74453
COGENT COGENT/PSI
Table 6.4
InputsandOutputs
T
3352
2119
6461
3301
19262
3320
s
1
382
139
135
126
112
0
S
2
195
262
0
4
0
211
S
3
15
143
8
6
7
0
AS#
3352
2119
6461
3301
19262
3320
E
−1.471
−0.322
−0.353
−0.107
−0.005
−0.157
to log mainly the peer level information such as IP addresses, etc. Since the con-
tents of many Internet torrents may involve copyright problems, no content will
be downloaded in our measurement. Moreover, a preprocess is applied to filter the
peer information of the PlanetLab probing nodes in the raw data.
Content size is a very important characteristic in all P2P systems. Figure 6.25
shows the distribution of content size among different data sets. We first observe
that the contents shared by BT video torrents are mostly very large. In video tor-
rents, the mean object size is approximately 1000 MB and 90% of video contents
are larger than 100 MB. Moreover, there are 5% of the video contents with the size
larger than 10 GB and the maximum video size reaches nearly 20 GB. On the other
hand, the size of nonvideo torrents is relatively small, with only 30% of the nonvideo
