Info

Public Audience

English

60 Minutes

Saarbrücken

This thesis proposes and evaluates new system designs to support two
emerging Internet workloads: (a) bulk content, such as downloads of large media and
scientific libraries, and (b) user-generated content (UGC), such as photos and videos that
users share online, typically on online social networks (OSNs).

Bulk content accounts for a large and growing fraction of today's
Internet traffic. Due to the high cost of bandwidth, delivering bulk content in the
Internet is expensive.
To reduce the cost of bulk transfers, I proposed traffic shaping and
scheduling designs that exploit the delay-tolerant nature of bulk transfers to allow ISPs
to deliver bulk content opportunistically. I evaluated my proposals through software
prototypes and simulations driven by real-world traces from commercial and academic
ISPs and found that they result in considerable reductions in transit costs or
increased link utilization.

The amount of user-generated content (UGC) that people share online
has been rapidly growing in the past few years. Most users share UGC
using online social networking websites (OSNs), which can impose
arbitrary terms of use, privacy policies, and limitations on the
content shared on their websites. To solve this problem, I evaluated
the feasibility of a system that allows users to share UGC directly
from the home, thus enabling them to regain control of the content
that they share online. Using data from popular OSN websites and a
testbed deployed in 10 households, I showed that current trends bode
well for the delivery of personal UGC from users' homes. I also
designed and deployed Stratus, a prototype system that uses home
gateways to share UGC directly from the home.

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